Lucent Technologies 555-230-024 manual Local Exchange Trunks, Tie Trunks, Auxiliary Trunks

Network Interfaces and Equipment

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 trunks, which allow you to place long-distance outgoing voice-grade calls to telephones in defined service areas, 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 trunks, which connect DEFINITY ECS to the local central office for incoming calls dialed directly to stations without attendant assistance

■Digital Service 1 trunks, which can be used to provide T1 or ISDN Primary Rate Interface 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.

Auxiliary Trunks

Auxiliary trunks connect devices in auxiliary cabinets with the switch. Some of the features that are supported with this type of trunk are recorded announcements, telephone dictation service, malicious call trace, and loudspeaker paging.

Miscellaneous Trunks

Miscellaneous trunks perform functions that do not fit neatly into any of those already described:

■Release-link trunks are used between switch locations to provide Centralized Attendant Service or Automatic Call Distribution group availability.

■Remote-access trunks provide off-premises users with access to DEFINITY ECS features and networking.

555-230-024 Issue 5 January 1998 12-9