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Network Interfaces and Equipment
Issue 5 January 1998
12-9555-230-024
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.