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IPML - Inter-Peripheral Message Link
Common Channel Interoffice Signaling No. 7
Common Channel Signaling (CCS) No. 7 or CCIS7 is a CCS system bases on
CCITT No. 7. CCIS7/CCS7 on the DMS switch consists of two parts the Message
Transfer Part (MTP) and the Interim Telephone user Part. They are compatible
with DMS-100, DMS-200, DMS-100/200, and DMS-100/DMS-100/200 with TOPS.
CCIS7 can't tell the difference between banded and direct signaling. CCIS7
uses Destination/Origination Point Codes (DPC/OPC) to rout back to the switch.
CCIS7 can handle Automatic Calling Card Service (ACCS), Enhanced INWATS,
Local Area Signaling Services, and Direct Service Dialing Capabilities.
Equal Access
The DMS-200 Access Tandem (AT) gives a traffic concentration and
distribution function for interLATA traffic originating and a distribution
function for interLATA traffic origination or terminating inside a Local
Access and Transport Area (LATA). This gives the interLATA Carrier (IC) access
to more that one end office inside the LATA. It can handle InterLata Carrier
access codes (10xxx), 10xxx and 950-yxxx dialing, Automatic Number
Identification (ANI) on all calls, answer supervision, equal access Automatic
Message Accounting (AMA) for both originating and terminating calls, and
operator service signaling.
The DMS-100 EA gives direct and tandem switched access service inside the
LATA for originating and terminating to interLATA Carriers. It is available
in the following three ways:
Equal Access End Office (EAEO)
DMS-100 Equal Access End Office (EAEO) gives a direct interconnection to
interLATA Carriers (IC) and international Carriers (INCs) Point of Presence
(POP) inside the LATA.
Access Tandem with Equal Access End Office
The DMS-200 Access Tandem (AT) when used with equal access end office (EAEO)
lets trunk tandem interconnect to ICs/INCs POP inside the LATA.
The connection of the Equal Access End Office (EAEO) to an IC/INC through
the DMS-200 Access Tandem (AT) uses what is called two-stage overlap output
pulsing which makes the time it takes to set up a call quicker. The AT uses
the digits OZZ + XXX out pulsed in the first stage to identify the IC/INC
dialed and to pick and outgoing trunk. Then a connection is established from
the IC/INC to the EAEO through the AT. The second stage digits, consist of
ANI and the called numbers are passed through the DMS- 200 AT at the IC/INC.
A AMA terminating record in AT&T format is produced by the DMS-200 for all
the EAEOs. A per call terminating AMA record is made for calls that get to
the stage where the trunk from the IC/INC has been seized and a "wink" has
been returned by the DMS-200 AT.
Access Tandem with a Non-Equal Access End Office
DMS-200 AT using a non-equal access end office gives trunk tandem
connection to an IC/INC POP within the LATA. To set up a call, connection of
Feature Group B (FGB) or Feature Group C (FGC) End Office to an IC/INC through
the DMS-200 AT, uses the standard Bell Central Automatic Message Accounting
(CAMA) signaling. The Access Tandem uses the XXX digits of the access code
950-YXXX out pulsed from the FGB end office to identify the IC/INC and to
connect to a outgoing trunk.
Mechanized Calling Card Service (MCCS)
The fraudulent use of calling cards, third number and collect calls and the
increasing movement to automate current operator services has directly led to
the implantation of the Mechanized Calling Card Service (MCCS) to DMS-200/TOPS
and to the remote and host Operator Centralization (OC).
MCCS uses CCIS to relay queries and responses to and from the DMS-200/TOPS.
Operator handled calling card calls and the direct entry by subscribers of
Calling Cards by DTMF (Touch-Tones) telephones are given special provisions by
the MCCS. Both, the operator handling and the direct entry of calling card
calls, are decreasing the size operators.
Billed Number Screening (BNS) gives an enhancement to the operator-handled
collect and third-number billing by using CCIS to screen a number at the
billing validation data base for billing restrictions (i.e. the third number
is a fortress). This feature naturally will reduce fraudulent use of the
collect call feature.
Common Channel Interoffice Signalling-Direct Signalling (CCIS-DS), which is
the feature that the MCCS is designed around, is used to transmit messages to
and from many possible Billing Validation Centers (BVCs). Messages
transmitted to the BVC about MCCS include the billing number and the Personal
Identification Number (PIN). In BNS the messages have the special billing
number (collect or third number). The return messages from the BVC include
validity (of the number), billing restrictions (if any), and the Revenue
Accounting Office (RAO) code.
Auxiliary Operator Services System
The DMS-200 Auxiliary Operator Services System (AOSS) is used primarily for
Directory Assistance and the intercept needs that are not included in the TOPS
package. The AOSS is similar to TOPS and co-exist with TOPS on the DMS-200
Toll system.