AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 80

Trunks
Primary Rate Interface Facility
See System Reference for more
detailed information.
Telephone Number
Use these instructions only if the type of service on the DS1 facility is
ISDN-PRI.
Decide the following options for each ISDN-PRI facility:
Telephone Number
Telephone Number to Send
Test Telephone Number
Timers and Counters
Terminal Equipment Identifier
B-Channel Groups
Note: Because of the complexity of the timer, counter, and terminal equipment
identifier information, the factory settings for them should rarely be changed.
Incorrect settings can have an adverse affect on the operation of ISDN-PRI
facilities. Consult with your AT&T representative or authorized dealer when you
plan options for PRI facilities.
Record your decisions about these options in the "ISDN-PRI Facility
Options" section of PBX System Form 3c (page 3). Make a copy of the form
for each 100D module with an ISDN-PRI service type. Record the slot number in
the 'Slot No." blank at the top of the form(s).
To allow the system to route calls to the correct destination, you can assign a
telephone number consisting of up to 12 digits.
The factory setting is that no telephone number is assigned. If you assign a
telephone number to a channel, it must match the number that is dialed by the
outside caller and sent to the system by the network. The numbers sent by the
network are furnished by the ISDN-PRI service provider. The number you assign
must also be unique within the same B-channel group and must be different
from the associated test telephone number. B-channel groups and test
telephone numbers are assigned later.
Planning Form Instructions
For all the channels you plan to assign a telephone number:
1.
Transfer the information from the "Trunk Type" column of PBX System
Form 2c, System Numbering - Trunk Jacks to Form 3c. Write the
logical ID and trunk number in the applicable column.
2.
Write the unique 12-digit telephone number furnished by the ISDN-PRI
service provider in the "Telephone Number" column on Form 3c.
Trunk Options 3-25