AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 94

Trunks
DID Trunks
Use these instructions
to the system.
DID trunks allow incoming calls to reach specific individuals, calling groups, the
listed directory number (QCC Queue) or Remote Access without going through
the operator. Blocks of DID numbers from the local telephone company are
reserved for use in the system. These blocks of numbers correspond to the
extension numbers in the system numbering plan you selected in the "System
Renumbering" section of Chapter 2.
CAUTION
DID numbers that correspond to pool dial-out codes (or facility access
codes) can be used to avoid toll restriction, leading to toll abuse and/or
fraud. (See "Customer Support Information
information on security.)
The options assigned to the DID trunks affect the way incoming calls are
directed to extension numbers in the system.
The options for DID trunks are as follows:
Type of DID Trunks
Expected Digits
Delete Digits
Add Digits
Signaling
Invalid Destination
Assign Trunks to Blocks
The options are assigned to blocks of trunks, and a maximum of two blocks is
allowed. Each block can be configured so that incoming calls can be directed to
specific extension numbers included in your system numbering plan. For
example, if the system has both 3- and 4-digit extension numbers, Block 1 could
contain the options needed to reach the 3-digit numbers, and Block 2 the
options needed to reach the 4-digit numbers.
Note: If you want to allow Remote Access on DID trunks, one of the telephone
numbers assigned by the telephone company must match the Remote Access
dial code. The factory setting is 889.
Record the DID trunk options on PBX System Form 3e, Outside Trunks —
DID. If your system will have two blocks, make a copy of Form 3e and write the
block number in the "Block Number" space.
only if Direct Inward Dial (DID) trunks are connected
n
in the front of this book for more
Trunk Options 3-39