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+# 3GPP TS 26.101 V18.0.0 (2024-03)
+
+Technical Specification
+
+## **3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec frame structure (Release 18)**
+
+![5G Advanced logo](64662465bba247703fdec49c8f3309f9_img.jpg)
+
+The logo for 5G Advanced, featuring a stylized '5G' with a green signal wave icon above the 'G' and the word 'ADVANCED' in smaller letters to the right.
+
+5G Advanced logo
+
+![3GPP logo](5fb340ad68b0c71df0b56698b137e35b_img.jpg)
+
+The logo for 3GPP, featuring the letters '3GPP' in a stylized font with a red signal wave icon below the 'P'.
+
+3GPP logo
+
+A GLOBAL INITIATIVE
+
+The present document has been developed within the 3rd Generation Partnership Project (3GPP™) and may be further elaborated for the purposes of 3GPP. The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented. This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification. Specifications and Reports for implementation of the 3GPP™ system should be obtained via the 3GPP Organizational Partners' Publications Offices.
+
+## **3GPP**
+
+---
+
+Postal address
+
+---
+
+3GPP support office address
+
+---
+
+650 Route des Lucioles - Sophia Antipolis  
+Valbonne - FRANCE  
+Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
+
+---
+
+Internet
+
+---
+
+<http://www.3gpp.org>
+
+## --- **Copyright Notification** ---
+
+No part may be reproduced except as authorized by written permission.  
+The copyright and the foregoing restriction extend to reproduction in all media.
+
+© 2024, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).  
+All rights reserved.
+
+UMTS™ is a Trade Mark of ETSI registered for the benefit of its members  
+3GPP™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners  
+LTE™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners  
+GSM® and the GSM logo are registered and owned by the GSM Association
+
+# --- Contents
+
+|                                                                                   |           |
+|-----------------------------------------------------------------------------------|-----------|
+| Foreword .....                                                                    | 4         |
+| 1 Scope.....                                                                      | 5         |
+| 2 References.....                                                                 | 5         |
+| 3 Definitions and Abbreviations .....                                             | 5         |
+| 3.1 Definitions.....                                                              | 5         |
+| 3.2 Abbreviations .....                                                           | 5         |
+| 4 AMR codec frame format (AMR IF1).....                                           | 6         |
+| 4.1 AMR Header and AMR Auxiliary Information .....                                | 6         |
+| 4.1.1 Frame Type, Mode Indication, and Mode Request .....                         | 6         |
+| 4.1.2 Frame Quality Indicator .....                                               | 7         |
+| 4.1.3 Mapping to TX_TYPE and RX_TYPE.....                                         | 7         |
+| 4.1.4 Codec CRC .....                                                             | 8         |
+| 4.2 AMR Core Frame.....                                                           | 8         |
+| 4.2.1 AMR Core Frame with speech bits: Bit ordering.....                          | 8         |
+| 4.2.2 AMR Core Frame with speech bits: Class division.....                        | 9         |
+| 4.2.3 AMR Core Frame with comfort noise bits .....                                | 9         |
+| 4.3 AMR frame composition.....                                                    | 10        |
+| 4.4 GSM-EFR Frame Composition.....                                                | 11        |
+| 4.4.1 GSM-EFR Frame with speech bits.....                                         | 12        |
+| 4.4.2 GSM-EFR Frame with comfort noise bits.....                                  | 12        |
+| <b>Annex A (informative): AMR Interface Format 2 (with octet alignment) .....</b> | <b>13</b> |
+| <b>Annex B (normative): Tables for AMR Core Frame bit ordering.....</b>           | <b>17</b> |
+| <b>Annex C (informative): Change history.....</b>                                 | <b>20</b> |
+
+# --- Foreword
+
+This Technical Specification has been produced by the 3<sup>rd</sup> Generation Partnership Project (3GPP).
+
+The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:
+
+Version x.y.z
+
+where:
+
+- x the first digit:
+  - 1 presented to TSG for information;
+  - 2 presented to TSG for approval;
+  - 3 or greater indicates TSG approved document under change control.
+- y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.
+- z the third digit is incremented when editorial only changes have been incorporated in the document.
+
+# --- 1 Scope
+
+The present document describes a generic frame format for the Adaptive Multi-Rate (AMR) speech codec and the Enhanced Full Rate (GSM-EFR) speech codec. This format shall be used as a common reference point when interfacing speech frames between different elements of the 3G system and between different systems. Appropriate mappings to and from this generic frame format will be used within and between each system element.
+
+Annex A describes a second frame format which shall be used when octet alignment of AMR frames is required.
+
+# --- 2 References
+
+The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
+
+- References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
+  - For a specific reference, subsequent revisions do not apply.
+  - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document *in the same Release as the present document*.
+- [1] TS 26.090: "AMR Speech Codec; Speech Transcoding Functions".
+- [2] TS 26.093: "AMR Speech Codec; Source Controlled Rate Operation".
+- [3] TS 26.092: "AMR Speech Codec; Comfort Noise Aspects".
+- [4] TS 46.060: "EFR Speech Codec; Speech Transcoding Functions".
+- [5] TS 46.062: "EFR Speech Codec; Comfort Noise Aspects".
+
+# --- 3 Definitions and Abbreviations
+
+## 3.1 Definitions
+
+For the purposes of the present document, the following terms and definitions apply:
+
+**AMR mode:** one of the eight AMR codec bit-rates denoted also with indices 0 to 7 where 0 maps to the 4.75 kbit/s mode and 7 maps to the 12.2 kbit/s mode.
+
+**AMR codec mode:** same as AMR mode.
+
+**RX\_TYPE:** classification of the received frame as defined in [2].
+
+**TX\_TYPE:** classification of the transmitted frame as defined in [2].
+
+## 3.2 Abbreviations
+
+For the purposes of the present document, the following abbreviations apply:
+
+|     |                                        |
+|-----|----------------------------------------|
+| CRC | Cyclic Redundancy Check                |
+| FQI | Frame Quality Indicator                |
+| GSM | Global System for Mobile communication |
+| LSB | Least Significant Bit                  |
+
+|      |                                                |
+|------|------------------------------------------------|
+| MSB  | Most Significant Bit                           |
+| RX   | Receive                                        |
+| PDC  | Personal Digital Communication (ARIB standard) |
+| SCR  | Source Controlled Rate operation               |
+| SID  | Silence Descriptor (Comfort Noise Frame)       |
+| TDMA | Time Division Multiple Access (IS-641)         |
+| TX   | Transmit                                       |
+
+# 4 AMR codec frame format (AMR IF1)
+
+This clause describes the generic frame format for both the speech and comfort noise frames of the AMR speech codec. This format is referred to as AMR Interface Format 1 (AMR IF1). Annex A describes AMR Interface Format 2 (AMR IF2).
+
+Each AMR codec mode follows the generic frame structure depicted in figure 1. The frame is divided into three parts: AMR Header, AMR Auxiliary Information, and AMR Core Frame. The AMR Header part includes the Frame Type and the Frame Quality Indicator fields. The AMR auxiliary information part includes the Mode Indication, Mode Request, and Codec CRC fields. The AMR Core Frame part consists of the speech parameter bits or, in case of a comfort noise frame, the comfort noise parameter bits. In case of a comfort noise frame, the comfort noise parameters replace Class A bits of AMR Core Frame while Class B and C bits are omitted.
+
+![Figure 1: Generic AMR frame structure diagram showing the hierarchy of fields: AMR Header (Frame Type, Frame Quality Indicator), AMR Auxiliary Information (Mode Indication, Mode Request, Codec CRC), and AMR Core Frame (Class A, B, and C bits).](1d27fed9c01eb99f6535283f35fe3bbf_img.jpg)
+
+|                                                                                                                                                                                                                                                                                                                                                          |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------|---------------------------------|--------------------------|-----------------------|--------------------|--------------|--------------|--------------|------------------------------------------------------------------------------------------------------------------------------------------------|
+| <table border="1"> <tr> <td>Frame Type (4 bits)</td> </tr> <tr> <td>Frame Quality Indicator (1 bit)</td> </tr> <tr> <td>Mode Indication (3 bits)</td> </tr> <tr> <td>Mode Request (3 bits)</td> </tr> <tr> <td>Codec CRC (8 bits)</td> </tr> <tr> <td>Class A bits</td> </tr> <tr> <td>Class B bits</td> </tr> <tr> <td>Class C bits</td> </tr> </table> | Frame Type (4 bits) | Frame Quality Indicator (1 bit) | Mode Indication (3 bits) | Mode Request (3 bits) | Codec CRC (8 bits) | Class A bits | Class B bits | Class C bits | AMR Header<br><br>AMR Auxiliary Information<br>(for Mode Adaptation, and Error Detection)<br><br>AMR Core Frame (speech or comfort noise data) |
+| Frame Type (4 bits)                                                                                                                                                                                                                                                                                                                                      |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Frame Quality Indicator (1 bit)                                                                                                                                                                                                                                                                                                                          |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Mode Indication (3 bits)                                                                                                                                                                                                                                                                                                                                 |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Mode Request (3 bits)                                                                                                                                                                                                                                                                                                                                    |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Codec CRC (8 bits)                                                                                                                                                                                                                                                                                                                                       |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Class A bits                                                                                                                                                                                                                                                                                                                                             |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Class B bits                                                                                                                                                                                                                                                                                                                                             |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+| Class C bits                                                                                                                                                                                                                                                                                                                                             |                     |                                 |                          |                       |                    |              |              |              |                                                                                                                                                |
+
+Figure 1: Generic AMR frame structure diagram showing the hierarchy of fields: AMR Header (Frame Type, Frame Quality Indicator), AMR Auxiliary Information (Mode Indication, Mode Request, Codec CRC), and AMR Core Frame (Class A, B, and C bits).
+
+Figure 1: Generic AMR frame structure
+
+## 4.1 AMR Header and AMR Auxiliary Information
+
+This subclause describes the AMR Header of figure 1.
+
+### 4.1.1 Frame Type, Mode Indication, and Mode Request
+
+Table 1a defines the 4-bit Frame Type field. Frame Type can indicate the use of one of the eight AMR codec modes, one of four different comfort noise frames, or an empty frame. In addition, three Frame Type Indices are reserved for future use. The same table is reused for the Mode Indication and Mode Request fields which are 3-bit fields each and are defined only in the range 0...7 to specify one of the eight AMR codec modes.
+
+**Table 1a: Interpretation of Frame Type, Mode Indication and Mode Request fields**
+
+| Frame Type | Mode Indication | Mode Request | Frame content (AMR mode, comfort noise, or other) |
+|------------|-----------------|--------------|---------------------------------------------------|
+| 0          | 0               | 0            | AMR 4,75 kbit/s                                   |
+| 1          | 1               | 1            | AMR 5,15 kbit/s                                   |
+| 2          | 2               | 2            | AMR 5,90 kbit/s                                   |
+| 3          | 3               | 3            | AMR 6,70 kbit/s (PDC-EFR)                         |
+| 4          | 4               | 4            | AMR 7,40 kbit/s (TDMA-EFR)                        |
+| 5          | 5               | 5            | AMR 7,95 kbit/s                                   |
+| 6          | 6               | 6            | AMR 10,2 kbit/s                                   |
+| 7          | 7               | 7            | AMR 12,2 kbit/s (GSM-EFR)                         |
+| 8          | -               | -            | AMR SID                                           |
+| 9          | -               | -            | GSM-EFR SID                                       |
+| 10         | -               | -            | TDMA-EFR SID                                      |
+| 11         | -               | -            | PDC-EFR SID                                       |
+| 12-14      | -               | -            | For future use                                    |
+| 15         | -               | -            | No Data (No transmission/No reception)            |
+
+### 4.1.2 Frame Quality Indicator
+
+The content of the Frame Quality Indicator field is defined in Table 1b. The field length is one bit. The Frame Quality Indicator indicates whether the data in the frame contains errors.
+
+**Table 1b: Definition of Frame Quality Indicator**
+
+| Frame Quality Indicator (FQI) | Quality of data                                                                |
+|-------------------------------|--------------------------------------------------------------------------------|
+| 0                             | Bad frame or Corrupted frame<br>(bits may be used to assist error concealment) |
+| 1                             | Good frame                                                                     |
+
+### 4.1.3 Mapping to TX\_TYPE and RX\_TYPE
+
+Table 1c shows how the AMR Header data (FQI and Frame Type) maps to the TX\_TYPE and RX\_TYPE frames defined in [2].
+
+**Table 1c: Mapping of Frame Quality Indicator and Frame Type to TX\_TYPE and RX\_TYPE [2], respectively**
+
+| Frame Quality Indicator | Frame Type Index | TX_TYPE or RX_TYPE      | Comment                                                                                                                       |
+|-------------------------|------------------|-------------------------|-------------------------------------------------------------------------------------------------------------------------------|
+| 1                       | 0-7              | SPEECH_GOOD             | The specific Frame Type Index depends on the bit-rate being used.                                                             |
+| 0                       | 0-7              | SPEECH_BAD              | The specific Frame Type Index depends on the bit-rate being used. The corrupted data may be used to assist error concealment. |
+| 1                       | 8                | SID_FIRST or SID_UPDATE | For AMR: SID_FIRST and SID_UPDATE are differentiated using one Class A bit: STI.                                              |
+| 0                       | 8                | SID_BAD                 | For AMR                                                                                                                       |
+| 1                       | 9                | GSM-EFR SID             | For GSM-EFR                                                                                                                   |
+| 0                       | 9                | GSM-EFR SID_BAD         | For GSM-EFR                                                                                                                   |
+| 1                       | 10-11            | SID_UPDATE              | For TDMA-EFR and PDC-EFR                                                                                                      |
+| 0                       | 10-11            | SID_BAD                 | For TDMA-EFR and PDC-EFR                                                                                                      |
+| 1                       | 15               | NO_DATA                 | Typically a non-transmitted frame or an erased or stolen frame with no data usable to assist error concealment.               |
+
+### 4.1.4 Codec CRC
+
+Generic AMR codec frames with Frame Type 0.11 are associated with an 8-bit CRC for error-detection purposes. The Codec CRC field of AMR Auxiliary Information in figure 1 contains the value of this CRC. These eight parity bits are generated by the cyclic generator polynomial:
+
+$$- G(x)=D^8+D^6+D^5+D^4+1$$
+
+which is computed over all Class A bits of AMR Core Frame. Class A bits for Frame Types 0.7 are defined in subclause 4.2.2 (for speech bits) and for Frame Types 8.11 in subclause 4.2.3 (for comfort noise bits).
+
+When Frame Type Index of table 1a is 15 the CRC field is not included in the Generic AMR frame.
+
+## 4.2 AMR Core Frame
+
+This subclause contains the description of AMR Core Frame of figure 1. The descriptions for AMR Core Frame with speech bits and with comfort noise bit are given separately.
+
+### 4.2.1 AMR Core Frame with speech bits: Bit ordering
+
+This subclause describes how AMR Core Frame carries the coded speech data. The bits produced by the speech encoder are denoted as  $\{s(1),s(2),\dots,s(K)\}$ , where  $K$  refers to the number of bits produced by the speech encoder as shown in table 2. The notation  $s(i)$  follows that of [1]. The speech encoder output bits are ordered according to their subjective importance. This bit ordering can be utilized for error protection purposes when the speech data is, for example, carried over a radio interface. Tables B.1 to B.8 in Annex B define the AMR IF1 bit ordering for all the eight AMR codec modes. In these tables the speech bits are numbered in the order they are produced by the corresponding speech encoder as described in the relevant tables of TS 26.090 [1]. The reordered bits are denoted below, in the order of decreasing importance, as  $\{d(0),d(1),\dots,d(K-1)\}$ .
+
+The ordering algorithm is described in pseudo code as:
+
+- for  $j = 0$  to  $K-1$
+- $d(j) := s(table_m(j)+1)$ ;
+
+where  $table_m(j)$  refers to the relevant table in Annex B depending on the AMR mode  $m=0..7$ . The Annex B tables should be read line by line from left to right. The first element of the table has the index 0.
+
+### 4.2.2 AMR Core Frame with speech bits: Class division
+
+The reordered bits are further divided into three indicative classes according to their subjective importance. This class division is only informative and provides supporting information for mapping this generic format into specific formats. The three different importance classes can then be subject to different error protection in the network.
+
+The importance classes are Class A, Class B, and Class C. Class A contains the bits most sensitive to errors and any error in these bits typically results in a corrupted speech frame which should not be decoded without applying appropriate error concealment. This class is protected by the Codec CRC in AMR Auxiliary Information. Classes B and C contain bits where increasing error rates gradually reduce the speech quality, but decoding of an erroneous speech frame is usually possible without annoying artefacts. Class B bits are more sensitive to errors than Class C bits. The importance ordering applies also within the three different classes and there are no significant step-wise changes in subjective importance between neighbouring bits at the class borders.
+
+The number of speech bits in each class (Class A, Class B, and Class C) for each AMR mode is shown in table 2. The classification in table 2 and the importance ordering  $d(j)$ , together, are sufficient to assign all speech bits to their correct classes. For example, when the AMR codec mode is 4,75, then the Class A bits are  $d(0)..d(41)$ , Class B bits are  $d(42)..d(94)$ , and there are no Class C bits.
+
+**Table 2: Number of bits in Classes A, B, and C for each AMR codec mode**
+
+| Frame Type | AMR codec mode | Total number of bits | Class A | Class B | Class C |
+|------------|----------------|----------------------|---------|---------|---------|
+| 0          | 4,75           | 95                   | 42      | 53      | 0       |
+| 1          | 5,15           | 103                  | 49      | 54      | 0       |
+| 2          | 5,90           | 118                  | 55      | 63      | 0       |
+| 3          | 6,70           | 134                  | 58      | 76      | 0       |
+| 4          | 7,40           | 148                  | 61      | 87      | 0       |
+| 5          | 7,95           | 159                  | 75      | 84      | 0       |
+| 6          | 10,2           | 204                  | 65      | 99      | 40      |
+| 7          | 12,2           | 244                  | 81      | 103     | 60      |
+
+### 4.2.3 AMR Core Frame with comfort noise bits
+
+The AMR Core Frame content for the additional frame type with Frame Type Index 8 in table 1a is described in this subclause. This consists of the frame related to Source Controlled Rate Operation specified in [2].
+
+The data content (comfort noise bits) of the additional frame types is carried in AMR Core Frame. The comfort noise bits are all mapped to Class A of AMR Core Frame and Classes B and C are not used. This is a notation convention only and the class division has no meaning for comfort noise bits.
+
+The number of bits in each class (Class A, Class B, and Class C) for the AMR comfort noise bits (Frame Type Index 8) is shown in table 3. The contents of SID\_UPDATE and SID\_FIRST are divided into three parts (SID Type Indicator (STI), Mode Indication ( $mi(i)$ ), and Comfort Noise Parameters ( $s(i)$ ) as defined in [2]. In case of SID\_FIRST the Comfort Noise Parameters bits ( $s(i)$ ) shall be set to "0".
+
+The comfort noise parameter bits produced by the AMR speech encoder are denoted as  $s(i) = \{s(1), s(2), \dots, s(35)\}$ . The notation  $s(i)$  follows that of [3]. These bits are numbered in the order they are produced by the AMR encoder without any reordering. These bits are followed by the SID Type Indicator **STI** and the Mode Indication  $mi(i) = \{mi(0), mi(1), mi(2)\} = \{LSB .. MSB\}$ . Thus, the AMR SID or comfort noise bits  $\{d(0), d(1), \dots, d(38)\}$  are formed as defined by the pseudo code below.
+
+- for  $j = 0$  to 34;
+- $d(j) := s(j+1)$ ;
+- $d(35) := STI$ ;
+- for  $j = 36$  to 38;
+- $d(j) := mi(j-36)$ . Note: This mapping is different to the usual mapping: LSB first.
+
+Note: The alternative would be:  $d(j) := m_i(38-j)$ : MSB first.
+
+**Table 3. Bit classification for Frame Type 8 (AMR SID)**
+
+| Frame Type Index | FQI | AMR TX_TYPE or RX_TYPE | Total number of bits | Class A                  |                          |                                | Class B | Class C |
+|------------------|-----|------------------------|----------------------|--------------------------|--------------------------|--------------------------------|---------|---------|
+|                  |     |                        |                      | SID Type Indicator (STI) | Mode Indication $m_i(i)$ | Comfort Noise Parameter $s(i)$ |         |         |
+| 8                | 1   | SID_UPDATE             | 39                   | 1 (= "1")                | 3                        | 35                             | 0       | 0       |
+| 8                | 1   | SID_FIRST              | 39                   | 1 (= "0")                | 3                        | 35 (= "0")                     | 0       | 0       |
+| 8                | 0   | SID_BAD                | 39                   | 1                        | 3                        | 35                             | 0       | 0       |
+
+The number of bits in each class (Class A, Class B, and Class C) for the comfort noise bits of Frame Types 9-11 is shown in Table 7.
+
+**Table 4: void**
+
+## 4.3 AMR frame composition
+
+The generic AMR frame is formed as a concatenation of AMR Header, AMR Auxiliary Information and the AMR Core Frame, in this order. The MSB of the Frame Type is placed in bit 8 of the first octet (see example in table 5 below), the LSB of the Frame Type is placed in bit 5. Then the next parameter follows, which is the Frame Quality Indicator, and so on. Between Mode Request and Codec CRC five spare bits are inserted to align the Codec CRC and the AMR Core frame to the octet boundary. The first bit of the AMR Core frame  $d(0)$  is placed in bit 8 of octet 4. The last bit of the generic AMR frame is the last bit of AMR Core Frame, which is the last bit of speech bits or the last bit of comfort noise bits, as defined in subclauses 4.2.1 and 4.2.3. Table 5 shows the composition for the example of the Codec Mode 6.7kbit/s and table 6 shows the composition for the AMR SID frame.
+
+**Table 5: Mapping of an AMR speech coding mode into the generic AMR frame, AMR IF1, example: AMR 6.7 kbit/s, "good frame", Mode Request = 1.**
+
+| Octet | MSB                       | Mapping of bits AMR 6.7 |          |          |          |                      |           | LSB    |
+|-------|---------------------------|-------------------------|----------|----------|----------|----------------------|-----------|--------|
+|       | bit 8                     | bit 7                   | bit 6    | bit 5    | bit 4    | bit 3                | bit 2     | bit 1  |
+| 1     | Frame Type (=3)           |                         |          |          | FQI      | Mode Indication (=3) |           |        |
+|       | 0                         | 0                       | 1        | 1        | 1        | 0                    | 1         | 1      |
+| 2     | Mode Request (=1)         |                         |          |          | spare    |                      |           |        |
+|       | 0                         | 0                       | 1        | 0        | 0        | 0                    | 0         | 0      |
+| 3     | Codec CRC                 |                         |          |          |          |                      |           |        |
+|       | CRC(7)                    | CRC(6)                  | CRC(5)   | CRC(4)   | CRC(3)   | CRC(2)               | CRC(1)    | CRC(0) |
+| 4     | AMR Core Frame (octet 1)  |                         |          |          |          |                      |           |        |
+|       | $d(0)$                    | $d(1)$                  | $d(2)$   | $d(3)$   | $d(4)$   | $d(5)$               | $d(6)$    | $d(7)$ |
+| 5..19 |                           |                         |          |          |          |                      |           |        |
+| 20    | AMR Core Frame (octet 17) |                         |          |          |          |                      | undefined |        |
+|       | $d(128)$                  | $d(129)$                | $d(130)$ | $d(131)$ | $d(132)$ | $d(133)$             |           |        |
+
+**Table 6: Mapping of an AMR SID frame into the generic AMR frame, AMR IF1, example: AMR SID\_Update, "good frame", Mode Indication = 3, Mode Request = 2.**
+
+| Octet | MSB                      | Mapping of bits<br>AMR SID |                  |        |                      |                 |        | LSB    |
+|-------|--------------------------|----------------------------|------------------|--------|----------------------|-----------------|--------|--------|
+|       | bit 8                    | bit 7                      | bit 6            | bit 5  | bit 4                | bit 3           | bit 2  | bit 1  |
+| 1     | Frame Type (=8)          |                            |                  |        | FQI                  | Mode Indication |        |        |
+|       | 1                        | 0                          | 0                | 0      | 1                    | undefined       |        |        |
+| 2     | Mode Request (=2)        |                            |                  | spare  |                      |                 |        |        |
+|       | MSB                      | ...                        | LSB              | 0      | 0                    | 0               | 0      | 0      |
+| 3     | Codec CRC                |                            |                  |        |                      |                 |        |        |
+|       | CRC(7)                   | CRC(6)                     | CRC(5)           | CRC(4) | CRC(3)               | CRC(2)          | CRC(1) | CRC(0) |
+| 4     | AMR Core Frame (octet 1) |                            |                  |        |                      |                 |        |        |
+|       | d(0)=s(1)                | d(1)=s(2)                  | d(2)             | d(3)   | d(4)                 | d(5)            | d(6)   | d(7)   |
+| 5..7  |                          |                            |                  |        |                      |                 |        |        |
+| 8     |                          |                            |                  | STI    | Mode Indication (=3) |                 |        | undef. |
+|       | d(32)                    | d(33)                      | d(34) =<br>s(35) | 1      | 1                    | 1               | 0      |        |
+
+Table 7 summarizes all possible AMR frame format combinations in terms of number of bits in each field.
+
+**Table 7. Number of bits for different fields in different AMR frame compositions**
+
+| Frame Type Index | Frame Type            | Frame Quality Indicator | Mode Indication | Mode Request | Codec CRC | Class A | Class B | Class C | Total |
+|------------------|-----------------------|-------------------------|-----------------|--------------|-----------|---------|---------|---------|-------|
+|                  | <b>AMR Core Frame</b> |                         |                 |              |           |         |         |         |       |
+| 0                | 4                     | 1                       | 3               | 3            | 8         | 42      | 53      | 0       | 114   |
+| 1                | 4                     | 1                       | 3               | 3            | 8         | 49      | 54      | 0       | 122   |
+| 2                | 4                     | 1                       | 3               | 3            | 8         | 55      | 63      | 0       | 137   |
+| 3                | 4                     | 1                       | 3               | 3            | 8         | 58      | 76      | 0       | 153   |
+| 4                | 4                     | 1                       | 3               | 3            | 8         | 61      | 87      | 0       | 167   |
+| 5                | 4                     | 1                       | 3               | 3            | 8         | 75      | 84      | 0       | 178   |
+| 6                | 4                     | 1                       | 3               | 3            | 8         | 65      | 99      | 40      | 223   |
+| 7                | 4                     | 1                       | 3               | 3            | 8         | 81      | 103     | 60      | 263   |
+| 8                | 4                     | 1                       | 3               | 3            | 8         | 39      | 0       | 0       | 58    |
+| 9                | 4                     | 1                       | 3               | 3            | 8         | 43      | 0       | 0       | 62    |
+| 10               | 4                     | 1                       | 3               | 3            | 8         | 38      | 0       | 0       | 57    |
+| 11               | 4                     | 1                       | 3               | 3            | 8         | 37      | 0       | 0       | 56    |
+| 12               | Not used              |                         |                 |              |           |         |         |         |       |
+| 13               | Not used              |                         |                 |              |           |         |         |         |       |
+| 14               | Not used              |                         |                 |              |           |         |         |         |       |
+| 15               | 4                     | 0                       | 0               | 0            | 0         | 0       | 0       | 0       | 4     |
+
+## 4.4 GSM-EFR Frame Composition
+
+This subclause contains the description of the generic GSM-EFR Frame of Figure 1. The descriptions for the generic GSM-EFR Frame with speech bits and with comfort noise bit are given separately.
+
+### 4.4.1 GSM-EFR Frame with speech bits
+
+The generic GSM-EFR frame for speech data bits is formed like for the AMR mode 12.2 kbit/s.
+
+The same Frame Type (Frame Type 7) is used also for GSM-EFR. The Mode Indication and Mode Request fields are set to "7". The GSM-EFR Core Frame for speech data bits is identical to the AMR Core Frame for speech data bits in the AMR mode with 12.2 kbit/s.
+
+### 4.4.2 GSM-EFR Frame with comfort noise bits
+
+The GSM-EFR Frame content for the additional frame type with Frame Type Index 9 in Table 1a are described in this subclause. This consists of the frame related to GSM-EFR Comfort Noise Aspects as specified in [4] and [5].
+
+The comfort noise bits are all mapped to Class A. Classes B and C are not used (see Table 7).
+
+The contents of GSM-EFR SID is the Comfort Noise Parameters ( $s(i)$ ) as defined in [4]. The Comfort noise parameters are computed as described in [5] by the GSM-EFR speech encoder and are denoted as  $s(i) = \{s(1), s(2), \dots, s(38), s(87), s(88), \dots, s(91)\}$ . The notation  $s(i)$  follows that of [4] (Table 6). The notation  $d(j) = \{d(0) \dots d(42)\}$  is local to the present document and is formed as defined by the pseudo code below.
+
+```
+for j = 0 to 37
+   $d(j) := s(j+1)$ ; /* LSP parameters in s(1) to s(38) */;
+
+for j = 38 to 42
+   $d(j) := s(j+49)$ ; /* fixed codebook gain parameter in s(87)-s(91) */
+```
+
+Table 8 shows the composition for the generic GSM-EFR SID frame.
+
+**Table 8: Mapping of the GSM-EFR SID frame into the generic AMR frame format, AMR IF1, Example of a good GSM-EFR SID frame (FQI=1).**
+
+| Octet | MSB                  | Mapping of bits for GSM-EFR SID |               |         |                      |               |               | LSB           |
+|-------|----------------------|---------------------------------|---------------|---------|----------------------|---------------|---------------|---------------|
+|       | bit 8                | bit 7                           | bit 6         | bit 5   | bit 4                | bit 3         | bit 2         | bit 1         |
+| 1     | Frame Type (=9)      |                                 |               | FQI     | Mode Indication (=7) |               |               |               |
+|       | 1                    | 0                               | 0             | 1       | 1                    | 1             | 1             | 1             |
+| 2     | Mode Request (=7)    |                                 |               | spare   |                      |               |               |               |
+|       | 1                    | 1                               | 1             | 0       | 0                    | 0             | 0             | 0             |
+| 3     | Codec CRC            |                                 |               |         |                      |               |               |               |
+|       | CRC(7)               | CRC(6)                          | CRC(5)        | CRC(4)  | CRC(3)               | CRC(2)        | CRC(1)        | CRC(0)        |
+| 4     | Core Frame (octet 1) |                                 |               |         |                      |               |               |               |
+|       | $d(0)=s(1)$          | $d(1)=s(2)$                     | $d(2)$        | $d(3)$  | $d(4)$               | $d(5)$        | $d(6)$        | $d(7)$        |
+| 5..7  |                      |                                 |               |         |                      |               |               |               |
+| 8     |                      |                                 |               |         |                      |               |               |               |
+|       | $d(32)$              | $d(33)$                         | $d(34)$       | $d(35)$ | $d(36)=s(37)$        | $d(37)=s(38)$ | $d(38)=s(87)$ | $d(39)=s(88)$ |
+| 9     |                      |                                 |               |         |                      |               |               |               |
+|       | $d(40)=s(89)$        | $d(41)=s(90)$                   | $d(42)=s(91)$ | 0       | 0                    | 0             | 0             | 0             |
+
+# Annex A (informative): AMR Interface Format 2 (with octet alignment)
+
+This annex defines an octet-aligned frame format for the AMR codec. This format is useful, for example, when the AMR codec is used in connection with applicable ITU-T H-series of recommendations. The format is referred to as AMR Interface Format 2 (AMR IF2).
+
+The AMR IF2 frame is formed by concatenation of the 4-bit Frame Type field (as defined for AMR IF1 in subclause 4.1.1) and the AMR Core Frame (as defined for AMR IF1 in subclause 4.2) as shown in figure A.1. The length of the AMR Core Frame field depends on the particular Frame Type. The total number of bits in the AMR IF2 speech frames in the different modes is typically not a multiple of eight and bit stuffing is needed to achieve an octet structure.
+
+![Figure A.1: Frame structure for AMR IF2. The diagram shows a vertical stack of five rectangular boxes representing the frame fields. From top to bottom, they are: 'Frame Type (4 bits)', 'Class A bits', 'Class B bits', 'Class C bits', and 'Bit Stuffing'. A line connects the 'Class B bits' box to a larger box on the right labeled 'AMR Core Frame (speech or comfort noise data)'.](ddc7460821484f1ae2835c67955c554c_img.jpg)
+
+Figure A.1: Frame structure for AMR IF2. The diagram shows a vertical stack of five rectangular boxes representing the frame fields. From top to bottom, they are: 'Frame Type (4 bits)', 'Class A bits', 'Class B bits', 'Class C bits', and 'Bit Stuffing'. A line connects the 'Class B bits' box to a larger box on the right labeled 'AMR Core Frame (speech or comfort noise data)'.
+
+Figure A.1: Frame structure for AMR IF2
+
+Table A.1a shows an example how the AMR 6.7 kbit/s mode is mapped into AMR IF2. The four LSBs of the first octet (octet 1) consist of the Frame Type(=3) for the AMR 6.7 kbit/s mode (see table 1a in AMR IF1 specification). This data field is followed by the 134 AMR Core Frame speech bits ( $d(0)\dots d(133)$ ) which consist of 58 Class A bits and 76 Class B bits as described in table 2 for AMR IF1. This results in a total of 138 bits and 6 bits are needed for Bit Stuffing to arrive to the closest multiple of 8 which is 144 bits.
+
+Table A.1a: Example mapping of the AMR speech coding mode 6.7kbit/s into AMR IF2.  
+The bits used for Bit Stuffing are denoted as UB (for "unused bit").
+
+|       | MSB              | Mapping of bits<br>AMR 6.7 |       |       |       |       |        | LSB    |
+|-------|------------------|----------------------------|-------|-------|-------|-------|--------|--------|
+| Octet | bit 8            | bit 7                      | bit 6 | bit 5 | bit 4 | bit 3 | bit 2  | bit 1  |
+| 1     | Frame Type (= 3) |                            |       |       |       |       |        |        |
+|       |                  |                            |       |       | MSB   | ..... |        | LSB    |
+| 2     | d(3)             | d(2)                       | d(1)  | d(0)  | 0     | 0     | 1      | 1      |
+| 3     | d(11)            | d(10)                      | d(9)  | d(8)  | d(7)  | d(6)  | d(5)   | d(4)   |
+| 18    | ...              | ...                        | ...   | ...   | ...   | ...   | d(133) | d(132) |
+|       | Stuffing bits    |                            |       |       |       |       |        |        |
+|       | UB               | UB                         | UB    | UB    | UB    | UB    | d(133) | d(132) |
+
+Table A.1b shows the composition of AMR IF2 frames for all Frame Types in terms of how many bits are used for each field of figure A.1.
+
+Tables A.2 to A.5 specify how the AMR Core Frame comfort noise bits of Frame Types 8-11 are mapped to AMR IF2. Table A.6 specifies the mapping for an empty frame ("no transmission").
+
+**Table A.1b: Composition of AMR IF2 Frames for all Frame Types.**
+
+| Frame Type Index | Frame content  | Number of bits in Frame Type | Number of Bits in AMR Core Frame | Number of Bits in Bit Stuffing | Number of octets (N) |
+|------------------|----------------|------------------------------|----------------------------------|--------------------------------|----------------------|
+| 0                | AMR 4,75       | 4                            | 95                               | 5                              | 13                   |
+| 1                | AMR 5,15       | 4                            | 103                              | 5                              | 14                   |
+| 2                | AMR 5,90       | 4                            | 118                              | 6                              | 16                   |
+| 3                | AMR 6,70       | 4                            | 134                              | 6                              | 18                   |
+| 4                | AMR 7,40       | 4                            | 148                              | 0                              | 19                   |
+| 5                | AMR 7,95       | 4                            | 159                              | 5                              | 21                   |
+| 6                | AMR 10,2       | 4                            | 204                              | 0                              | 26                   |
+| 7                | AMR 12,2       | 4                            | 244                              | 0                              | 31                   |
+| 8                | AMR SID        | 4                            | 39                               | 5                              | 6                    |
+| 9                | GSM-EFR SID    | 4                            | 43                               | 1                              | 6                    |
+| 10               | TDMA-EFR SID   | 4                            | 38                               | 6                              | 6                    |
+| 11               | PDC-EFR SID    | 4                            | 37                               | 7                              | 6                    |
+| 12-14            | For future use | -                            | -                                | -                              | -                    |
+| 15               | No Data        | 4                            | 0                                | 4                              | 1                    |
+
+**Table A.2: Mapping of bits for Frame Type 8 (AMR SID)  
+(Bits s1 to s35 refer to TS 26.092)**
+
+| Octet | MSB                                    | Mapping of bits<br>AMR SID             |       |       |                  |                          |       | LSB                                    |
+|-------|----------------------------------------|----------------------------------------|-------|-------|------------------|--------------------------|-------|----------------------------------------|
+|       | bit 8                                  | bit 7                                  | bit 6 | bit 5 | bit 4            | bit 3                    | bit 2 | bit 1                                  |
+| 1     | Index of 1 <sup>st</sup> LSF subvector | index of LSF reference vector          |       |       | Frame Type (= 8) |                          |       |                                        |
+|       | s4                                     | s3                                     | s2    | s1    | MSB<br>1         | 0                        | 0     | LSB<br>0                               |
+| 2     | Index of 2 <sup>nd</sup> LSF subvector | index of 1 <sup>st</sup> LSF subvector |       |       |                  |                          |       |                                        |
+|       | s12                                    | s11                                    | s10   | s9    | s8               | s7                       | s6    | s5                                     |
+| 3     |                                        | index of 2 <sup>nd</sup> LSF subvector |       |       |                  |                          |       |                                        |
+|       | s20                                    | s19                                    | s18   | s17   | s16              | s15                      | s14   | s13                                    |
+| 4     |                                        | index of 3 <sup>rd</sup> LSF subvector |       |       |                  |                          |       |                                        |
+|       | s28                                    | s27                                    | s26   | s25   | s24              | s23                      | s22   | s21                                    |
+| 5     | SID Type Indicator                     | frame energy                           |       |       |                  |                          |       | index of 3 <sup>rd</sup> LSF subvector |
+|       | t1                                     | s35                                    | s34   | s33   | s32              | s31                      | s30   | s29                                    |
+| 6     |                                        | Stuffing bits                          |       |       |                  | Mode Indication<br>mi(i) |       |                                        |
+|       | UB                                     | UB                                     | UB    | UB    | UB               | MSB<br>mi(2)             | mi(1) | LSB<br>mi(0)                           |
+
+Definitions of additional descriptor bits needed for the silence descriptor in the table are as follows: SID-type Indicator STI is {0=SID\_FIRST, 1=SID\_UPDATE }, Mode Indication (mi(0)- mi(2)) is the AMR codec mode according to the first eight entries in table 1a.
+
+**Table A.3: Mapping of bits for Frame Type 9 (GSM-EFR SID)**  
+ (Bits s1 to s91 refer to GSM 46.060)
+
+|       | MSB                                    | Mapping of bits<br>GSM-EFR SID |       |       |                                        |                                        |                                        | LSB   |
+|-------|----------------------------------------|--------------------------------|-------|-------|----------------------------------------|----------------------------------------|----------------------------------------|-------|
+| Octet | bit 8                                  | bit 7                          | bit 6 | bit 5 | bit 4                                  | bit 3                                  | bit 2                                  | bit 1 |
+| 1     | Index of 1 <sup>st</sup> LSF subMatrix |                                |       |       | Frame Type (= 9)                       |                                        |                                        |       |
+|       | s4                                     | s3                             | s2    | s1    | 1                                      | 0                                      | 0                                      | 1     |
+| 2     | Index of 2 <sup>nd</sup> LSF submatrix |                                |       |       | index of 1 <sup>st</sup> LSF subMatrix |                                        |                                        |       |
+|       | s12                                    | s11                            | s10   | s9    | s8                                     | s7                                     | s6                                     | s5    |
+| 3     | Index of 3 <sup>rd</sup> LSF submatrix |                                |       |       | Index of 2 <sup>nd</sup> LSF submatrix |                                        |                                        |       |
+|       | s20                                    | s19                            | s18   | s17   | s16                                    | s15                                    | s14                                    | s13   |
+| 4     | index of 4 <sup>th</sup> LSF submatrix |                                |       |       | sign of 3 <sup>rd</sup> LSF submatrix  | index of 3 <sup>rd</sup> LSF submatrix |                                        |       |
+|       | s28                                    | s27                            | s26   | s25   | s24                                    | s23                                    | s22                                    | s21   |
+| 5     | index of 5 <sup>th</sup> LSF submatrix |                                |       |       | index of 4 <sup>th</sup> LSF submatrix |                                        |                                        |       |
+|       | s36                                    | s35                            | s34   | s33   | s32                                    | s31                                    | s30                                    | s29   |
+| 6     | Stuffing bit                           | fixed codebook gain            |       |       |                                        |                                        | index of 5 <sup>th</sup> LSF submatrix |       |
+|       | UB                                     | s91                            | s90   | s89   | s88                                    | s87                                    | s38                                    | s37   |
+
+**Table A.4: Mapping of bits for Frame Type 10 (TDMA-EFR SID)**  
+ (Bits cn0 to cn37 refer to IS-641-A)
+
+|       | MSB                                     | Mapping of bits<br>TDMA-EFR SID |                                        |                                        |                                        |       |                                         | LSB   |
+|-------|-----------------------------------------|---------------------------------|----------------------------------------|----------------------------------------|----------------------------------------|-------|-----------------------------------------|-------|
+| Octet | bit 8                                   | bit 7                           | bit 6                                  | bit 5                                  | bit 4                                  | bit 3 | bit 2                                   | bit 1 |
+| 1     | Index of 1 <sup>st</sup> LSF subvector  |                                 |                                        |                                        | Frame Type (= 10)                      |       |                                         |       |
+|       | cn3                                     | cn2                             | cn1                                    | cn0                                    | 1                                      | 0     | 1                                       | 0     |
+| 2     | Index of 2 <sup>nd</sup> LSF subvector  |                                 |                                        |                                        | index of 1 <sup>st</sup> LSF subvector |       |                                         |       |
+|       | cn11                                    | Cn10                            | cn9                                    | cn8                                    | cn7                                    | cn6   | cn5                                     | cn4   |
+| 3     | Index of 3 <sup>rd</sup> LSF subvector  |                                 |                                        | Index of 2 <sup>nd</sup> LSF subvector |                                        |       |                                         |       |
+|       | cn19                                    | cn18                            | cn17                                   | cn16                                   | cn15                                   | cn14  | cn13                                    | cn12  |
+| 4     | Random Excitation Gain                  |                                 | index of 3 <sup>rd</sup> LSF subvector |                                        |                                        |       |                                         |       |
+|       | cn27                                    | cn26                            | cn25                                   | cn24                                   | cn23                                   | cn22  | cn21                                    | cn20  |
+| 5     | Index of 1 <sup>st</sup> RESC parameter |                                 | Random Excitation Gain                 |                                        |                                        |       |                                         |       |
+|       | cn35                                    | cn34                            | cn33                                   | cn32                                   | cn31                                   | cn30  | cn29                                    | cn28  |
+| 6     | Stuffing bits                           |                                 |                                        |                                        |                                        |       | Index of 2 <sup>nd</sup> RESC parameter |       |
+|       | UB                                      | UB                              | UB                                     | UB                                     | UB                                     | UB    | cn37                                    | cn36  |
+
+**Table A.5: Mapping of bits for Frame Type 11 (PDC-EFR SID)**  
+ (Bits s1 to s35 refer to ARIB xx)
+
+|       | MSB                                    | Mapping of bits<br>PDC-EFR SID         |       |       |                   |       |       | LSB                                    |
+|-------|----------------------------------------|----------------------------------------|-------|-------|-------------------|-------|-------|----------------------------------------|
+| Octet | bit 8                                  | bit 7                                  | bit 6 | bit 5 | bit 4             | bit 3 | bit 2 | bit 1                                  |
+| 1     | index of 1 <sup>st</sup> LSF subvector | index of LSF reference vector          |       |       | Frame Type (= 11) |       |       |                                        |
+|       | s4                                     | s3                                     | s2    | s1    | 1                 | 0     | 1     | 1                                      |
+| 2     | index of 2 <sup>nd</sup> LSF subvector | index of 1 <sup>st</sup> LSF subvector |       |       |                   |       |       |                                        |
+|       | s12                                    | s11                                    | s10   | s9    | s8                | s7    | s6    | s5                                     |
+| 3     | index of 2 <sup>nd</sup> LSF subvector |                                        |       |       |                   |       |       |                                        |
+|       | s20                                    | s19                                    | s18   | s17   | s16               | s15   | s14   | s13                                    |
+| 4     | index of 3 <sup>rd</sup> LSF subvector |                                        |       |       |                   |       |       |                                        |
+|       | s28                                    | s27                                    | s26   | s25   | s24               | s23   | s22   | s21                                    |
+| 5     | SID type                               | frame energy                           |       |       |                   |       |       | Index of 3 <sup>rd</sup> LSF subvector |
+|       | t1                                     | s35                                    | s34   | s33   | s32               | s31   | s30   | s29                                    |
+| 6     | Stuffing bits                          |                                        |       |       |                   |       |       | SID type                               |
+|       | UB                                     | UB                                     | UB    | UB    | UB                | UB    | UB    | t2                                     |
+
+Definition of additional descriptor bits needed for the table is as follows: SID-type is {0=POST0, 1=POST1(SID\_UPDATE), 2=PRE, 3=POST1\_BAD }, where LSB of SID\_type is t1 and MSB of SID-type is t2.
+
+**Table A.6: Mapping of bit for Frame Type 15 (No Data)**
+
+|       | MSB           | Mapping of Bits<br>No Data |       |       |                   |       |       | LSB   |
+|-------|---------------|----------------------------|-------|-------|-------------------|-------|-------|-------|
+| Octet | bit 8         | bit 7                      | bit 6 | bit 5 | bit 4             | bit 3 | bit 2 | bit 1 |
+| 1     | Stuffing bits |                            |       |       | Frame Type (= 15) |       |       |       |
+|       | UB            | UB                         | UB    | UB    | 1                 | 1     | 1     | 1     |
+
+# Annex B (normative): Tables for AMR Core Frame bit ordering
+
+This annex contains the tables required for ordering the AMR Core Frame speech bits corresponding to the different AMR modes. These tables represent  $table_m(j)$  in subclause 4.2.1 where  $m=0..7$  is the AMR mode. The tables are read from left to right so that the first element (top left corner) of the table has index 0 and the last element (the rightmost element of the last row) has the index  $K-1$  where  $K$  is the total number of speech bits in the specific mode. For example,  $table_0(20)=27$ , as defined in table B.1.
+
+**Table B.1: Ordering of the speech encoder bits for the 4.75 kbit/s mode:  $table_0(j)$**
+
+| j=0 | j=1 | j=2 | ... | ... | ... | ... | ... | ... | ... |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 0   | 1   | 2   | 3   | 4   | 5   | 6   | 7   | 8   | 9   |
+| 10  | 11  | 12  | 13  | 14  | 15  | 23  | 24  | 25  | 26  |
+| 27  | 28  | 48  | 49  | 61  | 62  | 82  | 83  | 47  | 46  |
+| 45  | 44  | 81  | 80  | 79  | 78  | 17  | 18  | 20  | 22  |
+| 77  | 76  | 75  | 74  | 29  | 30  | 43  | 42  | 41  | 40  |
+| 38  | 39  | 16  | 19  | 21  | 50  | 51  | 59  | 60  | 63  |
+| 64  | 72  | 73  | 84  | 85  | 93  | 94  | 32  | 33  | 35  |
+| 36  | 53  | 54  | 56  | 57  | 66  | 67  | 69  | 70  | 87  |
+| 88  | 90  | 91  | 34  | 55  | 68  | 89  | 37  | 58  | 71  |
+| 92  | 31  | 52  | 65  | 86  |     |     |     |     |     |
+
+**Table B.2: Ordering of the speech encoder bits for the 5.15 kbit/s mode:  $table_1(j)$**
+
+|    |    |    |     |     |     |    |    |    |    |
+|----|----|----|-----|-----|-----|----|----|----|----|
+| 7  | 6  | 5  | 4   | 3   | 2   | 1  | 0  | 15 | 14 |
+| 13 | 12 | 11 | 10  | 9   | 8   | 23 | 24 | 25 | 26 |
+| 27 | 46 | 65 | 84  | 45  | 44  | 43 | 64 | 63 | 62 |
+| 83 | 82 | 81 | 102 | 101 | 100 | 42 | 61 | 80 | 99 |
+| 28 | 47 | 66 | 85  | 18  | 41  | 60 | 79 | 98 | 29 |
+| 48 | 67 | 17 | 20  | 22  | 40  | 59 | 78 | 97 | 21 |
+| 30 | 49 | 68 | 86  | 19  | 16  | 87 | 39 | 38 | 58 |
+| 57 | 77 | 35 | 54  | 73  | 92  | 76 | 96 | 95 | 36 |
+| 55 | 74 | 93 | 32  | 51  | 33  | 52 | 70 | 71 | 89 |
+| 90 | 31 | 50 | 69  | 88  | 37  | 56 | 75 | 94 | 34 |
+| 53 | 72 | 91 |     |     |     |    |    |    |    |
+
+**Table B.3: Ordering of the speech encoder bits for the 5.9 kbit/s mode:  $table_2(j)$**
+
+|     |     |     |     |     |     |    |     |     |     |
+|-----|-----|-----|-----|-----|-----|----|-----|-----|-----|
+| 0   | 1   | 4   | 5   | 3   | 6   | 7  | 2   | 13  | 15  |
+| 8   | 9   | 11  | 12  | 14  | 10  | 16 | 28  | 74  | 29  |
+| 75  | 27  | 73  | 26  | 72  | 30  | 76 | 51  | 97  | 50  |
+| 71  | 96  | 117 | 31  | 77  | 52  | 98 | 49  | 70  | 95  |
+| 116 | 53  | 99  | 32  | 78  | 33  | 79 | 48  | 69  | 94  |
+| 115 | 47  | 68  | 93  | 114 | 46  | 67 | 92  | 113 | 19  |
+| 21  | 23  | 22  | 18  | 17  | 20  | 24 | 111 | 43  | 89  |
+| 110 | 64  | 65  | 44  | 90  | 25  | 45 | 66  | 91  | 112 |
+| 54  | 100 | 40  | 61  | 86  | 107 | 39 | 60  | 85  | 106 |
+| 36  | 57  | 82  | 103 | 35  | 56  | 81 | 102 | 34  | 55  |
+| 80  | 101 | 42  | 63  | 88  | 109 | 41 | 62  | 87  | 108 |
+| 38  | 59  | 84  | 105 | 37  | 58  | 83 | 104 |     |     |
+
+**Table B.4: Ordering of the speech encoder bits for the 6.7 kbit/s mode:  $table_3(j)$** 
+
+|     |     |     |     |     |     |     |     |     |     |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 0   | 1   | 4   | 3   | 5   | 6   | 13  | 7   | 2   | 8   |
+| 9   | 11  | 15  | 12  | 14  | 10  | 28  | 82  | 29  | 83  |
+| 27  | 81  | 26  | 80  | 30  | 84  | 16  | 55  | 109 | 56  |
+| 110 | 31  | 85  | 57  | 111 | 48  | 73  | 102 | 127 | 32  |
+| 86  | 51  | 76  | 105 | 130 | 52  | 77  | 106 | 131 | 58  |
+| 112 | 33  | 87  | 19  | 23  | 53  | 78  | 107 | 132 | 21  |
+| 22  | 18  | 17  | 20  | 24  | 25  | 50  | 75  | 104 | 129 |
+| 47  | 72  | 101 | 126 | 54  | 79  | 108 | 133 | 46  | 71  |
+| 100 | 125 | 128 | 103 | 74  | 49  | 45  | 70  | 99  | 124 |
+| 42  | 67  | 96  | 121 | 39  | 64  | 93  | 118 | 38  | 63  |
+| 92  | 117 | 35  | 60  | 89  | 114 | 34  | 59  | 88  | 113 |
+| 44  | 69  | 98  | 123 | 43  | 68  | 97  | 122 | 41  | 66  |
+| 95  | 120 | 40  | 65  | 94  | 119 | 37  | 62  | 91  | 116 |
+| 36  | 61  | 90  | 115 |     |     |     |     |     |     |
+
+**Table B.5: Ordering of the speech encoder bits for the 7.4 kbit/s mode:  $table_4(j)$** 
+
+|     |     |     |     |     |     |     |     |     |     |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 0   | 1   | 2   | 3   | 4   | 5   | 6   | 7   | 8   | 9   |
+| 10  | 11  | 12  | 13  | 14  | 15  | 16  | 26  | 87  | 27  |
+| 88  | 28  | 89  | 29  | 90  | 30  | 91  | 51  | 80  | 112 |
+| 141 | 52  | 81  | 113 | 142 | 54  | 83  | 115 | 144 | 55  |
+| 84  | 116 | 145 | 58  | 119 | 59  | 120 | 21  | 22  | 23  |
+| 17  | 18  | 19  | 31  | 60  | 92  | 121 | 56  | 85  | 117 |
+| 146 | 20  | 24  | 25  | 50  | 79  | 111 | 140 | 57  | 86  |
+| 118 | 147 | 49  | 78  | 110 | 139 | 48  | 77  | 53  | 82  |
+| 114 | 143 | 109 | 138 | 47  | 76  | 108 | 137 | 32  | 33  |
+| 61  | 62  | 93  | 94  | 122 | 123 | 41  | 42  | 43  | 44  |
+| 45  | 46  | 70  | 71  | 72  | 73  | 74  | 75  | 102 | 103 |
+| 104 | 105 | 106 | 107 | 131 | 132 | 133 | 134 | 135 | 136 |
+| 34  | 63  | 95  | 124 | 35  | 64  | 96  | 125 | 36  | 65  |
+| 97  | 126 | 37  | 66  | 98  | 127 | 38  | 67  | 99  | 128 |
+| 39  | 68  | 100 | 129 | 40  | 69  | 101 | 130 |     |     |
+
+**Table B.6: Ordering of the speech encoder bits for the 7.95 kbit/s mode:  $table_5(j)$** 
+
+|     |     |     |     |     |     |     |     |     |     |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 8   | 7   | 6   | 5   | 4   | 3   | 2   | 14  | 16  | 9   |
+| 10  | 12  | 13  | 15  | 11  | 17  | 20  | 22  | 24  | 23  |
+| 19  | 18  | 21  | 56  | 88  | 122 | 154 | 57  | 89  | 123 |
+| 155 | 58  | 90  | 124 | 156 | 52  | 84  | 118 | 150 | 53  |
+| 85  | 119 | 151 | 27  | 93  | 28  | 94  | 29  | 95  | 30  |
+| 96  | 31  | 97  | 61  | 127 | 62  | 128 | 63  | 129 | 59  |
+| 91  | 125 | 157 | 32  | 98  | 64  | 130 | 1   | 0   | 25  |
+| 26  | 33  | 99  | 34  | 100 | 65  | 131 | 66  | 132 | 54  |
+| 86  | 120 | 152 | 60  | 92  | 126 | 158 | 55  | 87  | 121 |
+| 153 | 117 | 116 | 115 | 46  | 78  | 112 | 144 | 43  | 75  |
+| 109 | 141 | 40  | 72  | 106 | 138 | 36  | 68  | 102 | 134 |
+| 114 | 149 | 148 | 147 | 146 | 83  | 82  | 81  | 80  | 51  |
+| 50  | 49  | 48  | 47  | 45  | 44  | 42  | 39  | 35  | 79  |
+| 77  | 76  | 74  | 71  | 67  | 113 | 111 | 110 | 108 | 105 |
+| 101 | 145 | 143 | 142 | 140 | 137 | 133 | 41  | 73  | 107 |
+| 139 | 37  | 69  | 103 | 135 | 38  | 70  | 104 | 136 |     |
+
+Table B.7: Ordering of the speech encoder bits for the 10.2 kbit/s mode:  $table_6(j)$ 
+
+|     |     |     |     |     |     |     |     |     |     |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 7   | 6   | 5   | 4   | 3   | 2   | 1   | 0   | 16  | 15  |
+| 14  | 13  | 12  | 11  | 10  | 9   | 8   | 26  | 27  | 28  |
+| 29  | 30  | 31  | 115 | 116 | 117 | 118 | 119 | 120 | 72  |
+| 73  | 161 | 162 | 65  | 68  | 69  | 108 | 111 | 112 | 154 |
+| 157 | 158 | 197 | 200 | 201 | 32  | 33  | 121 | 122 | 74  |
+| 75  | 163 | 164 | 66  | 109 | 155 | 198 | 19  | 23  | 21  |
+| 22  | 18  | 17  | 20  | 24  | 25  | 37  | 36  | 35  | 34  |
+| 80  | 79  | 78  | 77  | 126 | 125 | 124 | 123 | 169 | 168 |
+| 167 | 166 | 70  | 67  | 71  | 113 | 110 | 114 | 159 | 156 |
+| 160 | 202 | 199 | 203 | 76  | 165 | 81  | 82  | 92  | 91  |
+| 93  | 83  | 95  | 85  | 84  | 94  | 101 | 102 | 96  | 104 |
+| 86  | 103 | 87  | 97  | 127 | 128 | 138 | 137 | 139 | 129 |
+| 141 | 131 | 130 | 140 | 147 | 148 | 142 | 150 | 132 | 149 |
+| 133 | 143 | 170 | 171 | 181 | 180 | 182 | 172 | 184 | 174 |
+| 173 | 183 | 190 | 191 | 185 | 193 | 175 | 192 | 176 | 186 |
+| 38  | 39  | 49  | 48  | 50  | 40  | 52  | 42  | 41  | 51  |
+| 58  | 59  | 53  | 61  | 43  | 60  | 44  | 54  | 194 | 179 |
+| 189 | 196 | 177 | 195 | 178 | 187 | 188 | 151 | 136 | 146 |
+| 153 | 134 | 152 | 135 | 144 | 145 | 105 | 90  | 100 | 107 |
+| 88  | 106 | 89  | 98  | 99  | 62  | 47  | 57  | 64  | 45  |
+| 63  | 46  | 55  | 56  |     |     |     |     |     |     |
+
+Table B.8: Ordering of the speech encoder bits for the 12.2 kbit/s mode:  $table_7(j)$ 
+
+|     |     |     |     |     |     |     |     |     |     |
+|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
+| 0   | 1   | 2   | 3   | 4   | 5   | 6   | 7   | 8   | 9   |
+| 10  | 11  | 12  | 13  | 14  | 23  | 15  | 16  | 17  | 18  |
+| 19  | 20  | 21  | 22  | 24  | 25  | 26  | 27  | 28  | 38  |
+| 141 | 39  | 142 | 40  | 143 | 41  | 144 | 42  | 145 | 43  |
+| 146 | 44  | 147 | 45  | 148 | 46  | 149 | 47  | 97  | 150 |
+| 200 | 48  | 98  | 151 | 201 | 49  | 99  | 152 | 202 | 86  |
+| 136 | 189 | 239 | 87  | 137 | 190 | 240 | 88  | 138 | 191 |
+| 241 | 91  | 194 | 92  | 195 | 93  | 196 | 94  | 197 | 95  |
+| 198 | 29  | 30  | 31  | 32  | 33  | 34  | 35  | 50  | 100 |
+| 153 | 203 | 89  | 139 | 192 | 242 | 51  | 101 | 154 | 204 |
+| 55  | 105 | 158 | 208 | 90  | 140 | 193 | 243 | 59  | 109 |
+| 162 | 212 | 63  | 113 | 166 | 216 | 67  | 117 | 170 | 220 |
+| 36  | 37  | 54  | 53  | 52  | 58  | 57  | 56  | 62  | 61  |
+| 60  | 66  | 65  | 64  | 70  | 69  | 68  | 104 | 103 | 102 |
+| 108 | 107 | 106 | 112 | 111 | 110 | 116 | 115 | 114 | 120 |
+| 119 | 118 | 157 | 156 | 155 | 161 | 160 | 159 | 165 | 164 |
+| 163 | 169 | 168 | 167 | 173 | 172 | 171 | 207 | 206 | 205 |
+| 211 | 210 | 209 | 215 | 214 | 213 | 219 | 218 | 217 | 223 |
+| 222 | 221 | 73  | 72  | 71  | 76  | 75  | 74  | 79  | 78  |
+| 77  | 82  | 81  | 80  | 85  | 84  | 83  | 123 | 122 | 121 |
+| 126 | 125 | 124 | 129 | 128 | 127 | 132 | 131 | 130 | 135 |
+| 134 | 133 | 176 | 175 | 174 | 179 | 178 | 177 | 182 | 181 |
+| 180 | 185 | 184 | 183 | 188 | 187 | 186 | 226 | 225 | 224 |
+| 229 | 228 | 227 | 232 | 231 | 230 | 235 | 234 | 233 | 238 |
+| 237 | 236 | 96  | 199 |     |     |     |     |     |     |

marked/Rel-18/26_series/26130/raw.md

@@ -0,0 +1,943 @@
+
+
+# 3GPP TS 26.130 V18.1.0 (2024-06)
+
+*Technical Specification*
+
+## **3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Speech/Audio Codec RTP Payload Format Conformance for UE Testing (Release 18)**
+
+![5G Advanced logo](64662465bba247703fdec49c8f3309f9_img.jpg)
+
+The logo for 5G Advanced, featuring a stylized '5G' with a green signal wave icon above the 'G', and the word 'ADVANCED' in smaller letters to the right.
+
+5G Advanced logo
+
+![3GPP logo](5fb340ad68b0c71df0b56698b137e35b_img.jpg)
+
+The 3GPP logo, consisting of the letters '3GPP' in a bold, black, stylized font. Below the 'P' is a red signal wave icon. Underneath the logo, the text 'A GLOBAL INITIATIVE' is written in a smaller, all-caps font.
+
+3GPP logo
+
+The present document has been developed within the 3rd Generation Partnership Project (3GPP™) and may be further elaborated for the purposes of 3GPP. The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented. This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification. Specifications and Reports for implementation of the 3GPP™ system should be obtained via the 3GPP Organizational Partners' Publications Offices.
+
+## **3GPP**
+
+---
+
+Postal address
+
+---
+
+3GPP support office address
+
+---
+
+650 Route des Lucioles - Sophia Antipolis  
+Valbonne - FRANCE  
+Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
+
+Internet
+
+---
+
+<https://www.3gpp.org>
+
+## --- **Copyright Notification** ---
+
+No part may be reproduced except as authorized by written permission.  
+The copyright and the foregoing restriction extend to reproduction in all media.
+
+© 2024, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).  
+All rights reserved.
+
+UMTS™ is a Trade Mark of ETSI registered for the benefit of its members  
+3GPP™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners  
+LTE™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners  
+GSM® and the GSM logo are registered and owned by the GSM Association
+
+# Contents
+
+|                                                               |    |
+|---------------------------------------------------------------|----|
+| Foreword .....                                                | 5  |
+| Introduction .....                                            | 6  |
+| 1 Scope.....                                                  | 7  |
+| 2 References.....                                             | 7  |
+| 3 Definitions of terms, symbols and abbreviations .....       | 8  |
+| 3.1 Terms.....                                                | 8  |
+| 3.2 Symbols.....                                              | 8  |
+| 3.3 Abbreviations .....                                       | 8  |
+| 4 Interfaces.....                                             | 8  |
+| 4.1 General .....                                             | 8  |
+| 4.2 Acoustic interfaces .....                                 | 8  |
+| 4.3 Electrical interfaces .....                               | 9  |
+| 5 Test setup .....                                            | 9  |
+| 5.1 General .....                                             | 9  |
+| 5.2 Setup for terminals .....                                 | 9  |
+| 5.3 Setup of the electrical interfaces of test equipment..... | 9  |
+| 5.4 Accuracy of test equipment.....                           | 9  |
+| 5.5 Test signals.....                                         | 9  |
+| 5.6 Environmental conditions .....                            | 9  |
+| 5.7 System simulator conditions .....                         | 10 |
+| 6 RTP Payload Format Conformance for AMR .....                | 10 |
+| 6.1 Applicability.....                                        | 10 |
+| 6.2 SDP tests .....                                           | 10 |
+| 6.2.1 MO call.....                                            | 10 |
+| 6.2.2 MT calls.....                                           | 10 |
+| 6.3 RTP tests .....                                           | 11 |
+| 6.3.1 Test cases in sending .....                             | 11 |
+| 6.3.1.1 FT verification .....                                 | 11 |
+| 6.3.1.2 Q-bit verification.....                               | 12 |
+| 6.3.1.3 SID update periodicity .....                          | 12 |
+| 6.3.2 Test cases in receiving.....                            | 12 |
+| 6.3.2.1 Q-bit verification.....                               | 12 |
+| 6.3.3 Test cases with CMR.....                                | 12 |
+| 6.3.3.1 Response time definition .....                        | 12 |
+| 6.3.3.2 Open offer .....                                      | 13 |
+| 6.3.3.3 Restricted offer .....                                | 13 |
+| 6.4 RTCP tests.....                                           | 13 |
+| 6.4.1 General .....                                           | 13 |
+| 6.4.2 Verification of SR and RR reports .....                 | 13 |
+| 6.4.3 RTCP bandwidth verification.....                        | 13 |
+| 7 RTP Payload Format Conformance for AMR-WB.....              | 14 |
+| 7.1 Applicability.....                                        | 14 |
+| 7.2 SDP tests .....                                           | 14 |
+| 7.2.1 MO call.....                                            | 14 |
+| 7.2.2 MT calls.....                                           | 14 |
+| 7.3 RTP tests .....                                           | 15 |
+| 7.3.1 Test cases in sending .....                             | 15 |
+| 7.3.1.1 FT verification .....                                 | 15 |
+| 7.3.1.2 Q-bit verification.....                               | 16 |
+| 7.3.1.3 SID update periodicity .....                          | 16 |
+| 7.3.2 Test cases in receiving.....                            | 16 |
+| 7.3.2.1 Q-bit verification.....                               | 16 |
+
+|                               |                                              |           |
+|-------------------------------|----------------------------------------------|-----------|
+| 7.3.3                         | Test cases with CMR.....                     | 16        |
+| 7.3.3.1                       | Response time definition .....               | 16        |
+| 7.3.3.2                       | Open offer .....                             | 16        |
+| 7.3.3.2                       | Restricted offer .....                       | 17        |
+| 7.4                           | RTCP tests.....                              | 17        |
+| 7.4.1                         | General .....                                | 17        |
+| 7.4.2                         | Verification of SR and RR reports .....      | 17        |
+| 7.4.3                         | RTCP bandwidth verification.....             | 17        |
+| 8                             | RTP Payload Format Conformance for EVS ..... | 18        |
+| 8.1                           | Applicability.....                           | 18        |
+| 8.2                           | SDP tests .....                              | 18        |
+| 8.2.1                         | MO call.....                                 | 18        |
+| 8.2.2                         | MT calls.....                                | 18        |
+| 8.3                           | RTP tests .....                              | 20        |
+| 8.3.1                         | Test cases in sending .....                  | 20        |
+| 8.3.1.1                       | ToC byte verification.....                   | 20        |
+| 8.3.1.2                       | Q-bit verification.....                      | 20        |
+| 8.3.1.3                       | SID update periodicity .....                 | 21        |
+| 8.3.2                         | Test cases in receiving.....                 | 21        |
+| 8.3.2.1                       | Q-bit verification.....                      | 21        |
+| 8.3.2.2                       | Quality verification in receiving .....      | 21        |
+| 8.3.3                         | Test cases with CMR.....                     | 22        |
+| 8.3.3.1                       | Response time definition .....               | 22        |
+| 8.3.3.2                       | Open offer .....                             | 22        |
+| 8.3.3.3                       | Restricted offer .....                       | 22        |
+| 8.4                           | RTCP tests.....                              | 23        |
+| 8.4.1                         | General .....                                | 23        |
+| 8.4.2                         | Verification of SR and RR reports .....      | 23        |
+| 8.4.3                         | RTCP bandwidth verification.....             | 23        |
+| <b>Annex A (normative):</b>   | <b>Packet impairment profile.....</b>        | <b>24</b> |
+| <b>Annex B (informative):</b> | <b>Change history.....</b>                   | <b>25</b> |
+
+# Foreword
+
+This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
+
+The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:
+
+Version x.y.z
+
+where:
+
+- x the first digit:
+  - 1 presented to TSG for information;
+  - 2 presented to TSG for approval;
+  - 3 or greater indicates TSG approved document under change control.
+- y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.
+- z the third digit is incremented when editorial only changes have been incorporated in the document.
+
+In the present document, modal verbs have the following meanings:
+
+- shall** indicates a mandatory requirement to do something
+- shall not** indicates an interdiction (prohibition) to do something
+
+The constructions "shall" and "shall not" are confined to the context of normative provisions, and do not appear in Technical Reports.
+
+The constructions "must" and "must not" are not used as substitutes for "shall" and "shall not". Their use is avoided insofar as possible, and they are not used in a normative context except in a direct citation from an external, referenced, non-3GPP document, or so as to maintain continuity of style when extending or modifying the provisions of such a referenced document.
+
+- should** indicates a recommendation to do something
+- should not** indicates a recommendation not to do something
+- may** indicates permission to do something
+- need not** indicates permission not to do something
+
+The construction "may not" is ambiguous and is not used in normative elements. The unambiguous constructions "might not" or "shall not" are used instead, depending upon the meaning intended.
+
+- can** indicates that something is possible
+- cannot** indicates that something is impossible
+
+The constructions "can" and "cannot" are not substitutes for "may" and "need not".
+
+- will** indicates that something is certain or expected to happen as a result of action taken by an agency the behaviour of which is outside the scope of the present document
+- will not** indicates that something is certain or expected not to happen as a result of action taken by an agency the behaviour of which is outside the scope of the present document
+- might** indicates a likelihood that something will happen as a result of action taken by some agency the behaviour of which is outside the scope of the present document
+
+**might not** indicates a likelihood that something will not happen as a result of action taken by some agency the behaviour of which is outside the scope of the present document
+
+In addition:
+
+**is** (or any other verb in the indicative mood) indicates a statement of fact
+
+**is not** (or any other negative verb in the indicative mood) indicates a statement of fact
+
+The constructions "is" and "is not" do not indicate requirements.
+
+# --- Introduction
+
+The present document specifies requirements and test methods to verify correct implementations of the RTP payload format for 3GPP codecs in UE. The focus is on conversational services in LTE, NR and WLAN terminals when used to provide narrowband, wideband, super-wideband or fullband telephony.
+
+# --- 1 Scope
+
+The present document is applicable to any terminal capable of supporting narrowband, wideband, super-wideband or fullband telephony, either as a stand-alone service or as the telephony component of a multimedia service. The present document specifies requirements and test methods to verify correct implementations of the RTP payload format for 3GPP codecs in UE. The focus is on conversational services in LTE, NR and WLAN terminals when used to provide narrowband, wideband, super-wideband or fullband telephony.
+
+# --- 2 References
+
+The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
+
+- References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
+  - For a specific reference, subsequent revisions do not apply.
+  - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document *in the same Release as the present document*.
+- [1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
+- [2] 3GPP TS 26.132: "Speech and video telephony terminal acoustic test specification".
+- [3] 3GPP TS 26.139: "Real-time Transport Protocol (RTP) / RTP Control Protocol (RTCP) verification procedures".
+- [4] 3GPP TS 34.229-1: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 1: Protocol conformance specification".
+- [5] 3GPP TS 34.229-2: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 2: Implementation Conformance Statement (ICS) specification".
+- [6] 3GPP TS 34.229-3: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 3: Abstract test suite (ATS)".
+- [7] 3GPP TS 34.229-5: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 5: Protocol conformance specification using 5G System (5GS)".
+- [8] IETF RFC 4867: "RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs".
+- [9] 3GPP TS 26.445: "Codec for Enhanced Voice Services (EVS); Detailed algorithmic description".
+- [10] ITU-T Recommendation P.501 (06/2015): "Test signals for use in telephonometry".
+- [11] 3GPP TS 26.101: "Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec frame structure".
+- [12] 3GPP TS 26.190: "Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Transcoding functions".
+- [13] 3GPP TS 26.114: IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction.
+- [14] IETF RFC 3550: RTP: A Transport Protocol for Real-Time Applications.
+
+- [15] ITU-T Recommendation P.863 (09/2014): "Perceptual objective listening quality assessment".
+- [16] ITU-T Recommendation P.863.1 (09/2014): "Application guide for Recommendation ITU-T P.863".
+
+# --- 3 Definitions of terms, symbols and abbreviations
+
+## 3.1 Terms
+
+For the purposes of the present document, the terms given in TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].
+
+**Incoming CMR:** CMR in RTP packet received by the DUT
+
+**Receiving:** Link from test simulator to DUT
+
+**Sending:** Link from DUT to test simulator
+
+## 3.2 Symbols
+
+Void.
+
+## 3.3 Abbreviations
+
+For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 [1].
+
+|      |                                         |
+|------|-----------------------------------------|
+| DUT  | Device Under Test                       |
+| MO   | Mobile Originated                       |
+| MT   | Mobile Terminated                       |
+| SS   | System Simulator                        |
+| TX   | Transmission                            |
+| VoNR | 5G capable DUT supporting voice over NR |
+
+# --- 4 Interfaces
+
+## 4.1 General
+
+By default, electrical interfaces should be used for testing. Acoustic interfaces may be used as an alternative. The actual interfaces used in sending and receiving shall be documented.
+
+Test cases may be implemented either by injecting specific packet information (including CMR requests) in a live call or assuming a PCAP player scenario. To define the test setup, one approach is to reuse the test setup defined in TS 26.132 [2] (defining acoustical and electrical interfaces) where only LTE, WLAN and NR apply.
+
+If no acoustic measurement is required, the test setup in TS 26.139 [3] can be reused for RTP /RTCP "data injection" with either active or passive test instrument.
+
+## 4.2 Acoustic interfaces
+
+See clause 5.1 in TS 26.132 [2].
+
+## 4.3 Electrical interfaces
+
+See clause 5.2 in TS 26.132 [2].
+
+# --- 5 Test setup
+
+## 5.1 General
+
+Similar to clause 5.1 in TS 26.139 [3]:
+
+- The "system under test" is the device (DUT), or software to be tested
+- The "test instrument" is the equipment used to place an IMS call including configurable SIP and SDP parameters and to collect test data (SDP/RTP/RTCP output from the system under test). It can extract, calculate, and store information to check requirements for all the test described in the present document.
+- The "data injection" is the device or equipment used to generate RTP/RTCP data sent to the system under test.
+
+NOTE 1: 'data injection' may be collocated or integrated with the test instrument.
+
+NOTE 2: Data collection ('SDP/RTP / RTCP receiver') may be performed either by "test instrument" or collocated with "data injection" equipment.
+
+## 5.2 Setup for terminals
+
+See clause 5.2 in TS 26.132 [2] for the setup definition (Handset UE, Headset UE, Desktop-mounted hands-free UE, Hand-held hands-free UE, Softphone UE).
+
+## 5.3 Setup of the electrical interfaces of test equipment
+
+See clause 5.2 in TS 26.132 [2].
+
+For receive tests, where a user operated volume control is provided, the measurements [should/shall] be carried out at the nominal setting of the volume control.
+
+## 5.4 Accuracy of test equipment
+
+See clause 5.3 in TS 26.132 [2].
+
+## 5.5 Test signals
+
+See clause 5.4 in TS 26.132 [2].
+
+## 5.6 Environmental conditions
+
+See clause 6 in TS 26.132 [2].
+
+For LTE, WLAN, and NR connections, an RF shielded room should be one way to achieve these requirements on block error rate and jitter. Otherwise, care should be taken with potential sources of radio interference and their impact.
+
+## 5.7 System simulator conditions
+
+Test applicability and test result may depend on the SIM card or eSIM configuration. Depending on MNC and MCC, the DUT could be set in test mode or load specific parameters. Unless otherwise stated, a new call shall be established for each test case.
+
+# --- 6 RTP Payload Format Conformance for AMR
+
+## 6.1 Applicability
+
+The requirements and test methods in this clause shall apply when UE is used to provide narrowband telephony, either as a stand-alone service, or as part of a multimedia service.
+
+## 6.2 SDP tests
+
+### 6.2.1 MO call
+
+Requirement:
+
+Requirements on the SDP offer from the DUT are for further study.
+
+NOTE: SDP testing is already considered in [4,5,6,7].
+
+Test method:
+
+A call is established by the DUT. The SDP offer from the DUT shall be documented.
+
+### 6.2.2 MT calls
+
+Requirement:
+
+Requirements on the SDP answer from the DUT are for further study.
+
+NOTE: Verification of b=AS is for further study. Purpose is to check compliance to [13] Annex K: b=AS is expected to be set according to the highest allowed codec mode and other parameters (IP version, ptime, bandwidth efficient or octet-align mode) in the SDP answer.
+
+Test method:
+
+Every call is established by the system simulator using one AMR payload type in the SDP offer. The system simulator shall configure the SDP offer according to Table 6.2.2-1 for the bandwidth-efficient mode of AMR and Table 6.2.2-2 for the octet-aligned mode of AMR.
+
+For each SDP offer, the SDP answer from the DUT shall be documented and the corresponding RTP and RTCP streams shall be recorded.
+
+The test signal to be used for the measurements shall be the same in both directions as specified below depending on test cases:
+
+- speech1: the British-English single talk sequence described in ITU-T Recommendation P.501 [10].
+- silence1: test signal forced to silence (same length as speech1)
+- speech2: first sentence of the British-English single talk sequence described in ITU-T Recommendation P.501 [10] shortened to 2.4sec by selecting samples in interval [0.5sec, 2.9sec], repeated 16 times
+- silence2: test signal forced to silence (same length as speech2)
+
+- speech3: 3 repeats of the Composite Source Signal (CSS) according to ITU-T Recommendation P.501 [10] followed by a speech signal of 160s as in clause 7.10.4.2 of TS 26.132 [2]
+- silence3: test signal forced to silence (same length as speech3)
+
+In sending, for acoustic interfaces, the test signal level should be -4,7 dBPa measured at the MRP; for electrical interfaces, the active speech level of the signal should be calibrated to -60 dBV for analogue and to -16 dBm0 for digital connections.
+
+In receiving, the test signal level should be -16 dBm0 measured at the digital reference point or the equivalent analogue point.
+
+**Table 6.2.2-1: List of test cases for MT calls for given SDP offer (bandwidth-efficient)**
+
+| Test case | Parameter the SDP offer           | Mode-set in SDP answer | Input to DUT          | Input to system simulator |
+|-----------|-----------------------------------|------------------------|-----------------------|---------------------------|
+| amr-0     | mode-set=0                        | 0                      | speech1               | silence1                  |
+| amr-1     | mode-set=1                        | 1                      | speech1               | silence1                  |
+| amr-2     | mode-set=2                        | 2                      | speech1               | silence1                  |
+| amr-3     | mode-set=3                        | 3                      | speech1               | silence1                  |
+| amr-4     | mode-set=4                        | 4                      | speech1               | silence1                  |
+| amr-5     | mode-set=5                        | 5                      | speech1               | silence1                  |
+| amr-6     | mode-set=6                        | 6                      | speech1               | silence1                  |
+| amr-7     | mode-set=7                        | 7                      | speech1               | silence1                  |
+| amr-oo    | mode-set not present (open offer) | See NOTE 1             | speech1               | silence1                  |
+| amr-cmr1  | mode-set not present (open-offer) | See NOTE 1             | speech2 (see NOTE 2)  | speech2                   |
+| amr-cmr2  | mode-set=0,2,4,7                  | 0,2,4,7                | speech2 (see NOTE 2)  | speech2                   |
+| amr-qbit  | mode-set=7                        | 7                      | silence1              | speech1 (see NOTE 3)      |
+| amr-imp   | mode-set=7                        | 7                      | silence3 (see NOTE 4) | speech3                   |
+
+NOTE 1: The DUT may restrict the mode-set in its answer to a restricted set of AMR modes, e.g., to 0,2,4,7 or a further subset due to configuration.  
+NOTE 2: The system simulator inserts CMRs in the RTP stream in this test case.  
+NOTE 3: The system simulator forces Q bit to 0 in all packets of the RTP stream in test case 'amr-qbit'.  
+NOTE 4: The system simulator inserts packet impairments (using profile in Annex A) in the RTP stream in this test case.
+
+**Table 6.2.2-2: List of test cases for MT calls for given SDP offer (octet-aligned)**
+
+| Test case   | Parameter the SDP offer   | Mode-set in SDP answer | Input to DUT | Input to system simulator |
+|-------------|---------------------------|------------------------|--------------|---------------------------|
+| amr-octet-7 | mode-set=7; octet-align=1 | 7                      | speech1      | silence1                  |
+
+## 6.3 RTP tests
+
+### 6.3.1 Test cases in sending
+
+#### 6.3.1.1 FT verification
+
+Requirement:
+
+The FT entry in the ToC shall be match the active speech bit rate index according to RFC 4867 [9].
+
+The FT entry in the ToC shall be match the SID bit rate index according to RFC 4867 [9].
+
+Test method:
+
+- For each test case amr-0 to amr-7 (see clause 6.2.2), the ToC field is extracted for recorded RTP stream from the DUT and compared with the respective AMR mode (0 to 7) for active speech packets or SID bitrate for SID packets.
+
+NOTE: The value of FT is defined in Table 1a in 3GPP TS 26.101 [11] for AMR.
+
+#### 6.3.1.2 Q-bit verification
+
+Requirement:
+
+The Q-bit shall always be set to 1 in the RTP payload.
+
+NOTE: The Q-bit is the frame quality indicator [8]. If set to 0, it indicates that the corresponding frame is severely damaged, and the receiver should set the RX\_TYPE to either SPEECH\_BAD or SID\_BAD depending on the Frame Type (FT).]
+
+Test method: For each test case amr-0 to amr-7 (see clause 6.2.2), the Q-bit field is extracted from recorded RTP stream from the DUT and the value is compared to 1.
+
+#### 6.3.1.3 SID update periodicity
+
+Requirement:
+
+The DUT shall respect the SID update rules specified in [8]. SID frames shall be sent with the following pattern:
+
+- First SID frame 20 ms after the last speech frame (SID\_FIRST)
+- Second SID frame (first SID UPDATE): 60 ms after the first SID frame
+- Following SID UPDATE: every 160 ms
+
+NOTE: Network equipment may monitor RTP traffic and release the call (false communications cutting detection) if SID update is incorrect.
+
+Test method:
+
+For the test case amr-7 (see clause 6.2.2), analyse and report the RTP sending frames intervals for SID frames according to requirement.
+
+### 6.3.2 Test cases in receiving
+
+#### 6.3.2.1 Q-bit verification
+
+Requirement:
+
+Quality requirement are ffs.
+
+Test method:
+
+The system simulator shall send an AMR coded RTP stream where the Q bit is set to 0 and record the audio output from the DUT.
+
+### 6.3.3 Test cases with CMR
+
+#### 6.3.3.1 Response time definition
+
+The UE response time in the send direction (uplink) to an incoming CMR is defined as the delay between the send time of a packet containing the CMR at the network interface of the SS and the arrival time of an active speech packet from the UE in response to this CMR at the network interface of the SS.
+
+#### 6.3.3.2 Open offer
+
+Requirement:
+
+The AMR bit rate (FT field) in sending shall be according to the i-th incoming CMR inserted by the SS with a response time  $\leq 80$  ms and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80$  ms to  $(i+1) \cdot T_{\text{CMR}}$ .
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms).
+
+Test method:
+
+**Table 6.3.3.2: List of CMRs to insert**
+
+|           |      |      |      |      |      |      |      |      |
+|-----------|------|------|------|------|------|------|------|------|
+| i         | 0    | 1    | 2    | 3    | 4    | 5    | 6    | 7    |
+| CMR value | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |
+
+For the test case amr-cmr1 (see clause 6.2.2), the SS inserts the i-th CMR ( $i=0$  to  $7$ ) at send time  $i \cdot T_{\text{CMR}}$  according to Table 6.3.3.2, where  $T_{\text{CMR}}$  is 2.4sec; the FT field is extracted from recorded RTP stream from the DUT and the value for active speech frame is reported with the corresponding packet arrival time.
+
+#### 6.3.3.3 Restricted offer
+
+Requirement:
+
+The AMR bit rate (FT field) in sending shall be according to the i-th incoming CMR ( $i=0$  to  $7$ ) inserted by the SS with a response time  $\leq 80$  ms and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80$  ms to  $(i+1) \cdot T_{\text{CMR}}$ , if the mode in the CMR is defined in the mode-set, otherwise the AMR bit rate shall not change.
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms). Test method:
+
+For the test case amr-cmr2 (see clause 6.2.2), the SS inserts the i-th CMR ( $i=0$  to  $7$ ) at send time  $i \cdot T_{\text{CMR}}$  according to Table 6.3.3.2, where  $T_{\text{CMR}}$  is 2.4sec; the FT field is extracted from recorded RTP stream from the DUT and the value for active speech frame is reported with the corresponding packet arrival time.
+
+## 6.4 RTCP tests
+
+### 6.4.1 General
+
+If the DUT is compliant with TS 26.139 [3], the RTCP tests defined in this clause may be skipped, otherwise the clause applies.
+
+### 6.4.2 Verification of SR and RR reports
+
+Characterisation is performed for test case amr-imp. The following information shall be reported: packet loss in terms of 'fraction lost' and 'cumulative number of packets lost' according to the timing interval of impairments, number of inverted and duplicated packets, interarrival jitter (using a computation similar to [3] clause 6.2.3.2).
+
+NOTE1: Packets that arrive late are not counted as lost (see RFC 3550 [14]).
+
+NOTE2: If the loss is negative due to duplicates, the fraction lost is set to zero (see RFC 3550 [14]).
+
+### 6.4.3 RTCP bandwidth verification
+
+Characterisation is performed for test case amr-imp. RTCP bandwidth is checked using the computation in [3] clause 6.2.3.2, applied to the whole test duration.
+
+# 7 RTP Payload Format Conformance for AMR-WB
+
+## 7.1 Applicability
+
+The requirements and test methods in this clause shall apply when UE is used to provide wideband telephony, either as a stand-alone service, or as part of a multimedia service.
+
+## 7.2 SDP tests
+
+### 7.2.1 MO call
+
+Requirement:
+
+Requirements on the SDP offer from the DUT are for further study.
+
+NOTE: SDP testing is already considered in [4,5,6,7].
+
+Test method:
+
+A call is established by the DUT. The SDP offer from the DUT shall be documented.
+
+### 7.2.2 MT calls
+
+Requirement:
+
+Requirements on the SDP answer from the DUT are for further study.
+
+NOTE: Verification of b=AS is for further study. Purpose is to check compliance to [13] Annex K: b=AS is expected to be set according to the highest allowed codec mode and other parameters (IP version,ptime, bandwidth efficient or octet-align mode) in the SDP answer.
+
+Test method:
+
+Every call is established by the system simulator using one AMR-WB payload type in the SDP offer. The system simulator shall configure the SDP offer according to Table 7.2.2-1 for the bandwidth-efficient mode of AMR-WB and Table 7.2.2-2 for the octet-aligned mode of AMR-WB.
+
+For each SDP offer, the SDP answer from the DUT shall be documented and the corresponding RTP and RTCP streams shall be recorded.
+
+The test signal to be used for the measurements shall be the same in both directions as specified below depending on test cases:
+
+- speech1: the British-English single talk sequence described in ITU-T Recommendation P.501 [10].
+- silence1: test signal forced to silence (same length as speech1).
+- speech2: first sentence of the British-English single talk sequence described in ITU-T Recommendation P.501 [10] shortened to 2.4sec by selecting samples in interval [0.5sec, 2.9sec], repeated 16 times.
+- silence2: test signal forced to silence (same length as speech2).
+- speech3: 3 repeats of the Composite Source Signal (CSS) according to ITU-T Recommendation P.501 [10] followed by a speech signal of 160 s as in clause 7.10.4.2 of TS 26.132 [2].
+- silence3: test signal forced to silence (same length as speech3).
+
+In sending, for acoustic interfaces, the test signal level should be -4,7 dBPa measured at the MRP; for electrical interfaces, the active speech level of the signal should be calibrated to -60 dBV for analogue and to -16 dBm0 for digital connections.
+
+In receiving, the test signal level should be -16 dBm0 measured at the digital reference point or the equivalent analogue point.
+
+**Table 7.2.2-1: List of test cases for MT calls for given SDP offer (bandwidth-efficient)**
+
+| Test case  | Parameter the SDP offer           | Mode-set in SDP answer | Input to DUT          | Input to system simulator |
+|------------|-----------------------------------|------------------------|-----------------------|---------------------------|
+| amrwb-0    | mode-set=0                        | 0                      | speech1               | silence1                  |
+| amrwb-1    | mode-set=1                        | 1                      | speech1               | silence1                  |
+| amrwb-2    | mode-set=2                        | 2                      | speech1               | silence1                  |
+| amrwb-3    | mode-set=3                        | 3                      | speech1               | silence1                  |
+| amrwb-4    | mode-set=4                        | 4                      | speech1               | silence1                  |
+| amrwb-5    | mode-set=5                        | 5                      | speech1               | silence1                  |
+| amrwb-6    | mode-set=6                        | 6                      | speech1               | silence1                  |
+| amrwb-7    | mode-set=7                        | 7                      | speech1               | silence1                  |
+| amrwb-8    | mode-set=8                        | 8                      | speech1               | silence1                  |
+| amrwb-oo   | mode-set not present (open offer) | See NOTE 1             | speech1               | silence1                  |
+| amrwb-cmr1 | mode-set not present (open-offer) | See NOTE 1             | speech2 (see NOTE 2)  | speech2                   |
+| amrwb-cmr2 | mode-set=0,1,2                    | 0,1,2                  | speech2 (see NOTE 2)  | speech2                   |
+| amrwb-qbit | mode-set=2                        | 2                      | silence1              | speech1 (see NOTE 3)      |
+| amrwb-imp  | mode-set=2                        | 2                      | silence3 (see NOTE 4) | speech3                   |
+
+NOTE 1: The DUT may restrict the mode-set in its answer to a restricted set of AMR-WB modes, e.g., to 0,2,4,7 or a further subset due to configuration.  
+NOTE 2: The system simulator inserts CMRs in the RTP stream in this test case.  
+NOTE 3: The system simulator forces Q bit to 0 in all packets of the RTP stream in test case 'amr-qbit'.  
+NOTE 4: The system simulator inserts packet impairments (using profile in Annex A) in the RTP stream in this test case.
+
+**Table 7.2.2-2: List of test cases for MT calls for given SDP offer (octet-aligned)**
+
+| Test case     | Parameter the SDP offer   | Mode-set in SDP answer | Input to DUT | Input to system simulator |
+|---------------|---------------------------|------------------------|--------------|---------------------------|
+| amrwb-octet-2 | mode-set=2; octet-align=1 | 7                      | speech1      | silence1                  |
+
+## 7.3 RTP tests
+
+### 7.3.1 Test cases in sending
+
+#### 7.3.1.1 FT verification
+
+Requirement:
+
+The FT entry in the ToC shall be match the active speech bit rate index according to RFC 4867 [9].
+
+The FT entry in the ToC shall be match the SID bit rate index according to RFC 4867 [9].
+
+Test method:
+
+For each test case amrwb-0 to amrwb-8 (see clause 6.2.2), the ToC field is extracted for recorded RTP stream from the DUT and compared with the respective AMR-WB mode (0 to 8) for active speech packets or SID bitrate for SID packets.
+
+NOTE: The value of FT is defined in Table 1a in TS 26.190 [12] for AMR-WB.
+
+#### 7.3.1.2 Q-bit verification
+
+Requirement:
+
+The Q-bit shall always be set to 1 in the RTP payload.
+
+NOTE: The Q-bit is the frame quality indicator [8]. If set to 0, it indicates that the corresponding frame is severely damaged, and the receiver should set the RX\_TYPE to either SPEECH\_BAD or SID\_BAD depending on the frame type (FT).
+
+Test method:
+
+For each test case amrwb-0 to amrwb-8 (see clause 7.2.2), the Q-bit field is extracted from recorded RTP stream from the DUT and the value is compared to 1.
+
+#### 7.3.1.3 SID update periodicity
+
+Requirement:
+
+The DUT shall respect the SID update rules specified in [8]. SID frames shall be sent with the following pattern:
+
+- First SID frame 20ms after the last speech frame (SID\_FIRST)
+- Second SID frame (first SID UPDATE): 60 ms after the first SID frame
+- Following SID UPDATE: every 160 ms
+
+NOTE: Network equipment may monitor RTP traffic and release the call (false communications cutting detection) if SID update is incorrect.
+
+Test method:
+
+For the test case amrwb-7 (see clause 7.2.2), analyse and report the RTP sending frames intervals for SID frames according to requirement.
+
+### 7.3.2 Test cases in receiving
+
+#### 7.3.2.1 Q-bit verification
+
+Requirement:
+
+Quality requirement are ffs.
+
+Test method:
+
+The system simulator shall send an AMR-WB coded RTP stream where the Q bit is set to 0 and record the audio output from the DUT.
+
+### 7.3.3 Test cases with CMR
+
+#### 7.3.3.1 Response time definition
+
+The UE response time in the send direction (uplink) to an incoming CMR is defined as the delay between the send time of a packet containing the CMR at the network interface of the SS and the arrival time of an active speech packet from the UE in response to this CMR at the network interface of the SS.
+
+#### 7.3.3.2 Open offer
+
+Requirement:
+
+The AMR-WB bit rate (FT field) in sending shall be according to the i-th incoming CMR inserted by the SS with a response time  $\leq 80$  ms and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80$  ms to  $(i+1) \cdot T_{\text{CMR}}$ .
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms).
+
+Test method:
+
+**Table 7.3.3.2: List of CMRs to insert**
+
+|     |      |      |      |      |      |      |      |      |      |
+|-----|------|------|------|------|------|------|------|------|------|
+| i   | 0    | 1    | 2    | 3    | 4    | 5    | 6    | 7    | 8    |
+| CMR | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 | 1000 |
+
+For the test case amrwb-cmr1 (see clause 7.2.2), the SS inserts the i-th CMR ( $i=0$  to 8) at send time  $i \cdot T_{\text{CMR}}$  according to Table 7.3.3.2, where  $T_{\text{CMR}}$  is 2.4sec; the FT field is extracted from recorded RTP stream from the DUT and the value for active speech frame is reported with the corresponding packet arrival time.
+
+#### 7.3.3.2 Restricted offer
+
+Requirement:
+
+The AMR-WB bit rate (FT field) in sending shall be according to the i-th incoming CMR ( $i=0$  to 7) inserted by the SS with a response time  $\leq 80$  ms and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80$  ms to  $(i+1) \cdot T_{\text{CMR}}$ , if the mode in the CMR is defined in the mode-set, otherwise the AMR bit rate shall not change.
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms).
+
+Test method:
+
+For the test case amrwb-cmr2 (see clause 7.2.2), the SS inserts the i-th CMR ( $i=0$  to 7) at send time  $i \cdot T_{\text{CMR}}$  according to Table 7.3.3.2, where  $T_{\text{CMR}}$  is 2.4sec; the FT field is extracted from recorded RTP stream from the DUT and the value for active speech frame is reported with the corresponding packet arrival time.
+
+## 7.4 RTCP tests
+
+### 7.4.1 General
+
+If the DUT is compliant with TS 26.139 [3], the RTCP tests defined in this clause may be skipped, otherwise the clause applies.
+
+### 7.4.2 Verification of SR and RR reports
+
+Characterisation is performed for test case amr-wb-imp. The following information shall be reported: packet loss in terms of 'fraction lost' and 'cumulative number of packets lost' according to the timing interval of impairments, number of inverted and duplicated packets, interarrival jitter (using a computation similar to [3] clause 6.2.3.2).
+
+NOTE1: Packets that arrive late are not counted as lost (see RFC 3550 [14]).
+
+NOTE2: If the loss is negative due to duplicates, the fraction lost is set to zero (see RFC 3550 [14]).
+
+### 7.4.3 RTCP bandwidth verification
+
+Characterisation is performed for test case amr-wb-imp. RTCP bandwidth is checked using the computation in [3] clause 6.2.3.2, applied to the whole test duration.
+
+# 8 RTP Payload Format Conformance for EVS
+
+## 8.1 Applicability
+
+The requirements and test methods in this clause shall apply when UE is used to provide narrowband, wideband, super-wideband or fullband telephony, either as a stand-alone service, or as part of a multimedia service.
+
+## 8.2 SDP tests
+
+### 8.2.1 MO call
+
+Requirement:
+
+Requirements on the SDP offer from the DUT are for further study.
+
+NOTE: SDP testing is already considered in [4,5,6,7].
+
+Test method:
+
+A call is established by the DUT. The SDP offer from the DUT shall be documented.
+
+### 8.2.2 MT calls
+
+Requirement:
+
+Requirements on the SDP answer from the DUT are for further study.
+
+NOTE: Verification of b=AS is for further study. Purpose is to check compliance to [13] Annex Q: b=AS is expected to be set according to the operation mode (Primary or AMR-WB IO) with highest bitrate and other parameters (IP version, ptime, default or header-full mode) in the SDP answer.
+
+Test method:
+
+Every call is established by the system simulator using one EVS payload type in the SDP offer. The system simulator shall configure the SDP offer according to Table 8.2.2-1 for the default packetization mode of EVS (i.e., hf-only present) and Table 8.2.2-2 for the header-full packetization mode of EVS (i.e., hf-only=1).
+
+For each SDP offer, the SDP answer from the DUT shall be documented and the corresponding RTP and RTCP streams shall be recorded.
+
+The test signal to be used for the measurements shall be the same in both directions as specified below depending on test cases:
+
+- speech1: the British-English single talk sequence described in ITU-T Recommendation P.501 [10].
+- silence1: test signal forced to silence (same length as speech1).
+- speech2: first sentence of the British-English single talk sequence described in ITU-T Recommendation P.501 [10] shortened to 2.4sec by selecting samples in interval [0.5sec, 2.9sec], repeated 16 times.
+- silence2: test signal forced to silence (same length as speech2).
+- speech3: 3 repeats of the Composite Source Signal (CSS) according to ITU-T Recommendation P.501 [x13] followed by a speech signal of 160 s as in clause 7.10.4.2 of TS 26.132 [2].
+- silence3: test signal forced to silence (same length as speech3).
+
+In sending, for acoustic interfaces, the test signal level should be -4,7 dBPa measured at the MRP; for electrical interfaces, the active speech level of the signal should be calibrated to -60 dBV for analogue and to -16 dBm0 for digital connections.
+
+In receiving, the test signal level should be -16 dBm0 measured at the digital reference point or the equivalent analogue point.
+
+**Table 8.2.2-1: List of test cases for MT calls for given SDP offer (default packetization mode)**
+
+| Test case      | Parameter the SDP offer | Parameter the SDP answer | Input to DUT          | Input to system simulator |
+|----------------|-------------------------|--------------------------|-----------------------|---------------------------|
+| evs-primary-0  | br=5.9; bw=nb           | Same as in SDP offer     | speech1               | silence1                  |
+| evs-primary-1  | br=7.2; bw=wb           |                          | speech1               | silence1                  |
+| evs-primary-2  | br=8; bw=wb             |                          | speech1               | silence1                  |
+| evs-primary-3  | br=9.6; bw=wb           |                          | speech1               | silence1                  |
+| evs-primary-4  | br=13.2; bw=swb         |                          | speech1               | silence1                  |
+| evs-primary-5  | br=16.4; bw=swb         |                          | speech1               | silence1                  |
+| evs-primary-6  | br=24.4; bw=swb         |                          | speech1               | silence1                  |
+| evs-primary-7  | br=32; bw=fb            |                          | speech1               | silence1                  |
+| evs-primary-8  | br=48; bw=fb            |                          | speech1               | silence1                  |
+| evs-primary-9  | br=64; bw=fb            |                          | speech1               | silence1                  |
+| evs-primary-10 | br=96; bw=fb            |                          | speech1               | silence1                  |
+| evs-primary-11 | br=128; bw=fb           |                          | speech1               | silence1                  |
+| evs-io-0-recv  | br=5.9-24.4;bw=nb-swb   | Same as in SDP offer     | silence1              | speech3 (see NOTE1)       |
+| evs-io-1-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-2-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-3-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-4-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-5-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-6-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-7-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-io-8-recv  |                         |                          | silence1              | speech3 (see NOTE1)       |
+| evs-oo         | None (open offer)       | See NOTE 2               | speech1               | silence1                  |
+| evs-imp-recv   | br=24.4;bw=swb          | br=24.4; bw=swb          | silence3 (see NOTE 3) | speech3                   |
+
+NOTE 1: The system simulator encodes the input signal with EVS AMR-WB IO at the corresponding mode M for evs-io-M-recv (M=0 to 8).
+
+NOTE 2: The DUT may restrict the br parameter or mode-set in its answer to a restricted set of bitrate or AMR-WB-IO modes due to configuration.
+
+NOTE 3: The system simulator inserts packet impairments (using profile in Annex A) in the RTP stream in this test case.
+
+**Table 3b: List of test cases for MT calls for given SDP offer (header-full packetization mode).**
+
+| Test case                | Parameter the SDP offer                  | Parameter the SDP answer | Input to DUT         | Input to system simulator |
+|--------------------------|------------------------------------------|--------------------------|----------------------|---------------------------|
+| evs-cmr1-1 to evs-cmr1-7 | None (open-offer)                        | See NOTE 1               | speech2 (see NOTE 2) | speech2                   |
+| evs-cmr2-1 to evs-cmr2-7 | br=5.9-24.4; bw=swb                      | See NOTE 1               | speech2 (see NOTE 2) | speech2                   |
+| evs-io-cmr               | evs-mode-switch=1 hf-only=1              | See NOTE 1               | speech2 (see NOTE 3) | speech2                   |
+| evs-io-0                 | mode-set=0; evs-mode-switch=1; hf-only=1 | Same as in SDP offer     | speech1              | silence1                  |
+| evs-io-1                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-2                 | mode-set=1; evs-mode-switch=1            |                          | speech1              | silence1                  |
+| evs-io-3                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-4                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-5                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-6                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-7                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-8                 | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | speech1              | silence1                  |
+| evs-io-qbit              | mode-set=1; evs-mode-switch=1; hf-only=1 |                          | silence1             | speech1 (see NOTE 4)      |
+
+NOTE 1: The DUT may restrict the br parameter or mode-set in its answer to a restricted set of bitrate or AMR-WB-IO modes due to configuration.  
+NOTE 2: The system simulator inserts CMRs in the RTP stream in this test case.  
+NOTE 3: CMR to EVS AMR-BIO modes 14.25 and 19.85 are not supported in Compact mode, see Table A.2 in [x9], therefore this test case is defined in header-full mode.  
+NOTE 4: The system simulator forces Q bit to 0 in all packets of the RTP stream in test case 'evs-io-cmr'.
+
+## 8.3 RTP tests
+
+### 8.3.1 Test cases in sending
+
+#### 8.3.1.1 ToC byte verification
+
+Requirement:
+
+The ToC byte in each RTP active speech packet shall match the active bit rate, bandwidth, and operation mode according to Annex A of TS 26.445 [9].
+
+The ToC byte in each SID packet shall match the SID indication according to Annex A of TS 26.445 [9].
+
+Test method:
+
+For each test case evs-io-0 to evs-io-8 (see clause 8.2.2), the ToC field is extracted for recorded RTP stream from the DUT and compared with the respective operation mode for active speech and SID packets.
+
+#### 8.3.1.2 Q-bit verification
+
+Requirement:
+
+The Q-bit shall always be set to 1 in the RTP payload when EVS AMR-WB-IO and header-full modes are negotiated.
+
+NOTE: The Q-bit is the frame quality indicator [8]. If set to 0, it indicates that the corresponding frame is severely damaged, and the receiver should set the RX\_TYPE to either SPEECH\_BAD or SID\_BAD depending on the frame type (FT).
+
+Test method:
+
+For each test case evs-io-0 to evs-io-8 (see clause 8.2.2), the Q-bit field is extracted from recorded RTP stream from the DUT and the value is compared to 1.
+
+#### 8.3.1.3 SID update periodicity
+
+Requirement:
+
+The DUT shall respect the SID update rules described in clause 5.6.1.1 of TS 26.445 [9].
+
+SID frames shall be sent:
+
+- Either at a fixed rate: in such case interval shall be 20 ms multiple in range [60 ms; 2 s]
+- or at adaptative rate: in such case interval shall be 20 ms multiple in range [160 ms; 1 s]
+
+Test method:
+
+For the test case evs-primary-0 to evs-primary-11 and evs-io-0 to evs-io-7 (see clause 8.2.2), analyse and report the RTP sending frames intervals for SID frames according to requirement.
+
+### 8.3.2 Test cases in receiving
+
+#### 8.3.2.1 Q-bit verification
+
+Requirement:
+
+Quality requirement are ffs.
+
+Test method:
+
+The system simulator shall send an EVS AMR-WB-IO coded RTP stream where the Q bit is set to 0 (test case 'evs-io-qbit') and record the audio output from the DUT.
+
+#### 8.3.2.2 Quality verification in receiving
+
+Requirement:
+
+The score  $MOS-LQO_{TEST}$  shall be  $\geq 3.0$  in all receiving tests evs-io-0-recv to evs-io-8-recv.
+
+Test method:
+
+The speech quality of the signal is estimated using the measurement algorithm described in ITU-T Recommendation P.863 [15] in super-wideband mode. Level pre-alignment to -26 dBov of recordings shall be used – see P.863.1 clause 10.2 [16].
+
+A score shall be computed for each 8s speech sentence pair and averaged to produce a mean MOS-LQO value for the test conditions.
+
+$$MOS-LQO_{TEST} = (\sum_{i=1}^{20} MOS - LQO_{testcondition}(i))/20$$
+
+The synchronization between stimuli and degraded condition shall be done by the test system before applying the P.863 algorithm on each sentence pair according to TS 26.132 [2].
+
+### 8.3.3 Test cases with CMR
+
+#### 6.3.3.1 Response time definition
+
+The UE response time in the send direction (uplink) to an incoming CMR is defined as the delay between the send time of a packet containing the CMR at the network interface of the SS and the arrival time of an active speech packet from the UE in response to this CMR at the network interface of the SS.
+
+#### 8.3.3.2 Open offer
+
+Requirement:
+
+The EVS operation mode (Primary or AMR-WB IO), bandwidth, bit rate, and CAM operation in sending shall be according to the i-th CMR byte inserted by the SS with a response time  $\leq 80\text{ms}$  and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80\text{ ms}$  to  $(i+1) \cdot T_{\text{CMR}}$ , if a CMR is sent at time  $T_{\text{CMR}}$ .
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms).
+
+If the CMR value is 'Not used', the DUT is expected to ignore the value, i.e., it shall not change its encoding mode.
+
+Test method:
+
+**Table 8.3.3.2-1: List of CMRs (T value) to insert**
+
+|                        |     |     |     |     |     |     |     |
+|------------------------|-----|-----|-----|-----|-----|-----|-----|
+| j                      | 1   | 2   | 3   | 4   | 5   | 6   | 7   |
+| Value of T in CMR byte | 000 | 001 | 010 | 011 | 100 | 101 | 110 |
+
+**Table 8.3.3.2-2: List of CMRs (D value) to insert**
+
+|                        |      |      |      |      |      |      |      |      |
+|------------------------|------|------|------|------|------|------|------|------|
+| i                      | 0    | 1    | 2    | 3    | 4    | 5    | 6    | 7    |
+| Value of D in CMR byte | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |
+| i                      | 8    | 9    | 10   | 11   | 12   | 13   | 14   | 15   |
+| Value of D in CMR byte | 1000 | 1001 | 1010 | 1011 | 1100 | 1101 | 1110 | 1111 |
+
+For the test case evs-cmr1-j where j=1 to 7 (see clause 8.2.2), the SS inserts the i-th CMR byte (i=0 to 7) at send time  $i \cdot T_{\text{CMR}}$ , where  $T_{\text{CMR}}$  is 2.4sec; the CMR byte is defined according to TS 26.445 Table A.3 [9] with the T value according to Table 8.3.3.2-1 and the D value according to Table 8.3.3.2-2. If the requested operation in the CMR byte is 'Not used', CMR byte shall be sent. The ToC byte is extracted from recorded RTP stream from the DUT and the operation mode, bandwidth, bit rate, and CAM operation for active speech frame is reported.
+
+#### 8.3.3.3 Restricted offer
+
+Requirement:
+
+The EVS operation mode (Primary or AMR-WB IO), bandwidth, bit rate, and CAM operation in sending shall be according to the i-th CMR byte inserted by the SS with a response time  $\leq 80\text{ ms}$  and shall be valid until the next CMR over a time interval ranging from  $i \cdot T_{\text{CMR}} + 80\text{ ms}$  to  $(i+1) \cdot T_{\text{CMR}}$ , if a CMR byte is sent at time  $T_{\text{CMR}}$  and the requested operation in the CMR is allowed by the accepted SDP answer, otherwise it shall not change.
+
+NOTE: The expected response time is 60 ms, a margin of 20 ms is added to account for SS delay (assuming SS delay is less than 20 ms).
+
+Test method:
+
+For the test case evs-cmr2-j where j=1 to 7 (see clause 8.2.2), , the SS inserts the i-th CMR byte (i=0 to 7) at send time  $i.T_{CMR}$ , where  $T_{CMR}$  is 2.4sec; the CMR byte is defined according to TS 26.445 Table A.3 [9] with the T value according to Table 8.3.3.2-1 and the D value according to Table 8.3.3.2-2. The ToC byte is extracted from recorded RTP stream from the DUT and the operation mode, bandwidth, bit rate, and CAM operation for active speech frame is reported.
+
+## 8.4 RTCP tests
+
+### 8.4.1 General
+
+If the DUT is compliant with TS 26.139 [3], the RTCP tests defined in this clause may be skipped, otherwise the clause applies.
+
+### 8.4.2 Verification of SR and RR reports
+
+Characterisation is performed for test case evs-imp-recv. The following information shall be reported: packet loss in terms of 'fraction lost' and 'cumulative number of packets lost' according to the timing interval of impairments, number of inverted and duplicated packets, interarrival jitter (using a computation similar to [3] clause 6.2.3.2).
+
+NOTE1: Packets that arrive late are not counted as lost (see RFC 3550 [14]).
+
+NOTE2: If the loss is negative due to duplicates, the fraction lost is set to zero (see RFC 3550 [14]).
+
+### 8.4.3 RTCP bandwidth verification
+
+Characterisation is performed for test case evs-imp. RTCP bandwidth is checked using the computation in [3] clause 6.2.3.2, applied to the whole test duration.
+
+# --- Annex A (normative): Packet impairment profile
+
+The impairment profile used in RTCP tests is defined in [2] Annex F.
+