Nortel Networks NN43001-106 - Manual (Page 159)

Feature description 159
Special numbers 01, 011, 411, 611, 800, and 911 are allowed by default.
These special numbers, however, can be restricted in the Code Restriction
Block so that they cannot be dialed successfully.
Code Restriction Blocks only perform three-digit screening. For 1+ dialing
areas, the system can ignore the 1 when examining the TLD telephone
dialed number. The 1 is later outpulsed with the dialed number to complete
the call successfully.
Trunk Group Access Restriction
Trunk Group Access Restriction (TGAR) controls access to the exchange
network, TIE trunks, CCSA trunks, and paging and dictation services.
Telephones (LD 10, LD 11), TIE trunks (LD 14), Direct Inward System
Access (DISA) trunks (LD 24), Meridian Mail channels (LD 11), and
Authorization Codes (LD 88) are assigned a TGAR code, which is used to
block access to certain trunk groups entirely.
There can be up to 32 TGAR codes in use on a system (0-31).
When a telephone or TIE trunk dials the access code to a trunk route,
the system first checks the Class of Service of the terminal. If access is
allowed, the TGAR is checked next. If the TGAR of the originating terminal
matches one of the listed Trunk Access Restriction Group (TARG) codes
programmed against the trunk group, access is denied. Intercept treatment
is given to denied calls. A list of TARG codes can be programmed in LD 16
against each route, where applicable, to block access by certain terminals.
Optionally, the TGAR can be used to block access to certain routes even
when a BARS or NARS access code is dialed and the route is being seized.
To enable/disable the TGAR option, the TGAR prompt must be defined in
the Electronic Switched Network (ESN) data block in LD 86.
When denied access because of TGAR, a user may still gain access to a
route through the attendant console or an unrestricted terminal.
If the attendant uses the Trunk Group Busy (TGB) keys on the console to
make trunk groups busy, terminals with TGAR code 0-7 are intercepted to
the attendant when they access the route by dialing or try to gain access
using ESN access codes. Terminals with TGAR code 8-31 continue to have
access to the route, unaffected by the activation of the TGB keys.
The default, TGAR code 1, means the terminal is Conditionally Toll Denied
(CTD).
Nortel Communication Server 1000
Features and Services - Book 1 of 6 (A to B)
NN43001-106 01.04 Standard
Release 5.0 27 July 2007
Copyright © 2007, Nortel Networks
.