AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 149

Lines and Trunks
Number of Digits to Delete (a number from 0 to 4 digits, factory setting
= 0) describes the number of digits to delete from the incoming address
digits. A values greater than 4 will be blocked.
Digits to Add (a number from 0 to 9999, factory setting = 0) describes
the digits to prepend to the collected digits in order to determine a
routing number,
The following options can be programmed on a DID trunk-by-trunk basis:
Trunk Disconnect Timing (a number from 10 ms to 2550 ms, factory
setting = 500 ms) is used by the DID circuit module to determine the time
needed before a disconnect from the CO is considered valid.
Trunk Number is the "line number, " assigned to every trunk or line in the
system on startup, that serves as the trunk number. This trunk number
can be changed by System Numbering.
Alphanumeric Label is an ASCII string with up to seven characters
(factory setting = OUTSIDE) that can be assigned to an individual DID
trunk.
DID trunks can be programmed in a pool but on system resets these trunks are
not placed in a default pool. The board renumbering mechanism automatically
removes DID trunks from pools.
DID trunks can be assigned via system line programming as DFTs on any
station in the system, but they will never be automatically assigned to any
station in the system, including the operator position. The intent of having a DFT
for a DID trunk is not for receiving or originating calls, but to allow monitoring the
facility by observing the lamp.
DID trunks cannot be assigned as Music On Hold ports, page ports, or given
direct access to calling groups.
You can program the DID feature in modes other than Hybrid/PBX; note,
however, that the DID feature works on/y in Hybrid/PBX mode.
In Release 2.0, if the B-channel already has been programmed as a non-DID
type trunk, the following items will block programming of the B-channel for DID
operation:
Trunk is programmed to ring into a DGC group
Trunk is programmed for Remote Access
Trunk is owned by a station for Coverage/Call Forwarding
Direct Inward Dialing (DID) Lines/Trunks
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