AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 69

Trunks
Pools
See "Tie Trunks' in this chapter for
information on dial-in and automatic-in
tie-trunk types.
3-14 Trunk Options
Planning Form Instructions
Record class of restriction on Form 3a. Use page 3 for class of restriction
without barrier codes and page 4 for class of restriction with barrier codes.
Note: Page 4 of Form 3a holds programming information for four barrier
codes. Duplicate the form if more barrier codes are planned.
Page 3 of Form 3a has two sections: "DID or Tie Trunks" and "Non-Tie
Trunks". For each section:
Check "Outward Restrict" to keep the factory setting.
1.
Check either "Unrestricted" or "Toll Restrict" to change from outward
2.
restricted.
Under the "Allowed List Access" and "Disallowed List Access" headings:
Check the boxes if you plan to assign these lists.
3.
Note: The ARS Restriction Level and Allowed and Disallowed List numbers
will be filled in later.
On page 4 of Form 3a, for each barrier code:
Write the barrier code number in the space provided. Start with 1 and
4.
number sequentially.
Write the 4-digit barrier code in the "Digits" space. To keep the code
5.
private, leave the space blank.
Repeat Steps 1 through 3 listed under the page 3 instructions.
6.
Pools allow you to group the outside trunks so that users can select trunks by a
System Access button on the telephone instead of having a separate button for
each trunk in the system.
The system can have up to 11 pools with factory-set pool dial-out codes of 70
and 890-899. When the system is set up, the following pool assignments are
made automatically:
All loop-start (basic and special-purpose) trunks are assigned to the main
pool. The factory-set extension number, or pool dial-out code, is 70.
All dial-in tie trunks are assigned to the pool with the pool dial-out code
number 891.
All automatic-in tie trunks are assigned to the pool with the pool dial-out code
892.
The factory setting for type of trunk connected to a 400 GS/LS/TTR, 800 GS/LS,
or 408 GS/LS module is loop-start. For this reason, the system does not
automatically assign ground-start trunks to pools, nor does the system
automatically make pool assignments for loop-start, ground-start, or tie trunks
that are emulated using a T1 facility. If you want any of these types grouped in a
pool, you must manually assign each trunk to the pool of your choice.