Lucent Technologies 9400, 8400 manual Trunk Group Circuits, Local Exchange Trunks, Tie Trunks

DEFINITY Enterprise Communications Server Release 8.2	Issue 1
Overview 555-233-002	April 2000
System Management Features
Trunk Management	76

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.