Lucent Technologies 555-230-024 User Manual

Network Interfaces and Equipment

Issue 5    January 1998

555-230-024

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 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 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 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.