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WHEN TO USE DID TRUNKS
DID trunks provide fast access to specific individuals. DID trunks should be considered when a customer
has sales people who work with assigned territories, service people who work with ‘assigned accounts, or
any other organization seeking personal accountability. DID trunks, especially when combined with station
features like bridged appearances, combine the flexibility of key system operation with the sophisticated
options of the LEGEND system.
DID service is not available from all Central Offices, so always check availability before suggesting the
service to a customer. Remember that DID trunks provide incoming service only. For outgoing calls use
ground-start or WATS trunks.
TIE TRUNKS:
Simple Tie Trunk Operation
This application is perhaps the most common instance of the terms “trunk” and “line” being used
interchangeably. This type of facility links two PBXs.
In typical operation a user on the local PBX would like to speak to a station user at a remote PBX over a tie
trunk. The user on the local PBX lifts the handset to his telephone and gets dial tone from the local PBX.
The user dials the access code for the tie trunk, the local PBX connects the telephone to the tie trunk, and
the user on the local PBX hears dial tone from the remote PBX. The local station user then dials the
extension number of the remote user.
The switching capabilities of
both
PBXs are utilized in a call placed over tie facilities, so this facility is
properly called a “trunk.”
.
\fBSimple Tie Trunk Operation\fR