User's Manual

System Management Features

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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