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Dialing '#56' indicates 56kb/s alternate voice/data transmission. the '10XXX' |
identifies the carrier to be used for the call. If '10XXX' is not dialed on an |
inter-LATA call, the primary carrier of the subscriber is used. If '10XXX' is |
not dialed on an intra-LATA call, the telco handles the call. The long term |
plan also allows for several abbreviated forms. Dialing '#56 10XXX #' is |
allowed for routing a call which prompts the customer to dial according to the |
carrier dialing plan. Dialing '#56 10XXX' followed by a speed call is also |
allowed. If a customer has pre-subscribed to a carrier which can carry CSDC |
calls and the CSDC access code is stored as part of the speed calling number, |
the customer dials the speed calling code to make a CSDC call. |
Regular ringing is applied to the called line and audible ringing is applied |
to the calling terminal. Once the voice connection is established, either |
party can initiate the switch to data mode, if desired. To initiate a change |
in mode a CSDC user must initiate a mode switch command via a closure of the NCT |
An example of a mode switch: |
Suppose party A wants to switch to data. Party A issues a mode switch |
command and receives a signal called far end voice (FEV) which is a bipolar |
sequence (2031 hz at 60 ipm). Party A may now hang up the handset at any time |
after initiating the mode switch command. Party B receives a far end data |
(FED) tone (2031 Hz at 39 ipm) indicating party A wants to switch to data. If |
party B agrees to switch to data, party B must initiate a mode switch command. |
Party B may nor hang up the handset. Data transmission is now possible. |
To switch to the voice mode, anyone can initiate it. To switch, party A |
would pick up the handset and initiate a mode switch command and will receive |
the FED tone. Party B receives the FEV tone indicating that party A wants to |
go voice. Party B must now pick up the hand set and initiate a mode switch |
command. To terminate a call, either party may just leave the handset on and |
indicate a mode switch. If termination is issued during a mode conflict, time |
out will disconnect the call, usually about 10 or 11 seconds. |
Centrex/ESSX-1 customers may utilize the CSDC service in several ways if they |
have CSDC terminals with the necessary on premises equipment. The standard |
CSDC call is initiated by dialing the message network access code, (9). The |
dialing sequence is then identical to the plan for MTS: |
#99 AB (1+) 7 or 10 digits (interim plan) |
#56 (10XXX) (1+) 7 or 10 digits (#) (long term plan) |
The dialing pattern to establish interCentrex or intraCentrex CSDC calls is as |
follows: |
CSDC access code + extension |
An intraCentrex/CSDC call is initiated by dialing the trunk access code |
assigned to route a loop-around Centrex/CSDC trunk group. Next, the extension |
of the desired station is dialed. To establish an interCentrex call a |
different trunk access code must be used to route the CSDC calls to another |
Centrex group instead of a station. |
The CSDC maintenance circuit has a dialable digital loopback. This loopback is |
very useful in CSDC testing. A customer can check their access line by dialing |
the test DN. The loop is automatically activated when the call is answered. |
================ |
=End of Part I.= |
================ |
Part II: The CSDC hardware, and office data structures. |
======================================================= |
= (c) 1986 The Executioner and The PhoneLine Phantoms = |
======================================================= |
==Phrack Inc.== |
Volume Two, Issue Ten, Phile #6 of 9 |
-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#- |
! ! |
# Hacking Primos Part I # |
! ! |
# By Evil Jay # |
! ! |
# Phone Phreakers of America # |
! ! |
# (C) 1986-87 # |
! ! |
-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#- |
Author Note: |
I should begin by saying that there are other files out there about hacking |
Primos, one written recently, that basically tell you nothing at all as far as |
in-depth Primos is concerned. Those files should be deleted and this put in |
its place. This is the first in many files on Primos, and I will go into many |
topics, such as the on-line network, the different subsystems and other |
subjects. Hope you enjoy! |
*** Gaining Entry Part 1 *** |
Gaining entry, as always, is the hardest part. |
When you call a Primos system it will connect with something like this: |
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