AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 432

Lines and Trunks
Do not mix different service areas of WATS (Wide Area Telecommunications
Service) trunks or FX (Foreign Exchange) lines to different cities. Do not include
both incoming only and outgoing only lines/trunks in a pool.
If you want to reassign a line/trunk to a different pool, you must remove it from
the current pool before you assign it to the new pool. Once you assign a
line/trunk to a pool, it can be assigned to a button only on a direct-line console
operator position; individual lines intended for personal use on telephones other
than the DLC console should not be assigned to pools.
DID trunks cannot be grouped in pools. Loop-start are automatically placed in
pools and must be removed manually if used for paging loudspeakers, Music on
Hold, or maintenance alarms.
Dial-in tie trunks should not be grouped in pools if you intend to assign Pool
buttons on telephones.
If you are using Automatic Route Selection, the main pool (factory-set dial-out
code 70) must contain loop- or ground-start trunks.
The system provides an error tone when a line/trunk is in use or if a loudspeaker
paging system, Music on Hold, or maintenance alarm is already assigned;
however, the system does not indicate the reason for the error tone.
NOTE:
This procedure applies to Hybrid/PBX mode only.
Summary: Trunks to Pools Assignment
Programmable by
Mode
Idle Condition
Planning Form
Factory Setting
Valid Entries
Inspect
Copy Option
Console Procedure To program a single line/trunk:
4–60
Programming Procedures
System manager
Hybrid/PBX
Trunk idle
Form 2c, System Numbering: Line/Trunk Jacks
All loop-start trunks are assigned to the main trunk pool
(factory-set extension number 70); all tie trunks are
assigned to the trunk pool with the factory-set extension
number 891; no factory-set extensions numbers are
assigned to ground-start trunks.
Line numbers
Yes
Yes
LinesTrunks Pools
entry mode Dial no. of the line/trunk
Exit
Dial pool dial-out code
Enter
Select
Exit