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Trunk Management
DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
Trunk Group Circuits
Trunks provide the communications links between DEFINITY ECS and other switches,
including Central Office switches and other premises switches. Trunks that perform the
same function are grouped together and administered as trunk groups. Trunks interface
with DEFINITY ECS via port circuit packs. DEFINITY ECS trunk group circuit types
include the following:
Local Exchange Trunks
Local exchange trunks connect DEFINITY ECS to a Central Office. The following are
some of the types available:
■ Central Office trunks, which connect DEFINITY ECS to the local Central Office for
incoming and outgoing calls
■ Foreign Exchange trunks, which connect DEFINITY ECS to a Central Office other
than the local one
■ Wide Area Telecommunications Service (WATS) trunks, which allow you to place
long-distance outgoing voice-grade calls to telephones in defined service areas.
The calls are priced according to distance in the service area, length of the call,
time of day, and the day of the week
■ 800-service trunks, which let your business pay the charges for inbound
long-distance calls so that callers can reach you toll-free
■ Direct Inward Dialing (DID) trunks, which connect DEFINITY ECS to the local
Central Office for incoming calls dialed directly to stations without Attendant
assistance
■ Digital Service 1 (DS1) trunks, which can be used to provide T1 or ISDN Primary
Rate Interface (PRI) service
Tie Trunks
Tie trunks carry communications between DEFINITY ECS and other switches in a private
network. Several types of trunks can be used, depending on the type of private network
you establish.
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