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DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
System Management Features
77
Trunk Management
Auxiliary Trunks
Auxiliary trunks connect devices in auxiliary cabinets with the DEFINITY ECS. Some of
the features that are supported with this type of trunk are recorded announcements,
telephone dictation service, malicious call trace, and loudspeaker paging.
Central Office: The location housing telephone switching equipment that provides local
telephone service and access to toll facilities for long-distance calling.
Advanced Private Line Termination (APLT)
Provides access to and termination from CO (Central Office)-based private networks;
namely, Common Control Switching Arrangements (CCSA) and Enhanced Private
Switched Communications Service (EPSCS). APLT trunks are physically the same as
those used for analog tie trunks, where the trunk signaling is compatible with EPSCS and
CCSA network switches. The outgoing APLT trunk repeats any number of digits to the
private network as dialed. APLT trunks can tandem through the PBX from EPSCS
network only; CCSA networks require an Attendant to complete the call.
Direct Inward/Outward Dialing (DIOD)
Traditionally, CO (Central Office) trunks and DID (Direct Inward Dialing) trunks interface a
PBX with a Central Office. A CO trunk services outgoing calls and accepts incoming calls
that are terminated at the Attendant. A DID trunk is used for calls that need to be
terminated without an Attendant interaction.
The DIOD trunk combines the features of a CO trunk and a DID trunk to provide both
outgoing and incoming calls with addressing information in both directions.
IP Trunks
IP trunk groups may be defined as a virtual private network’s tie lines between DEFINITY
ECS systems or ITS-E servers. Each DEFINITY IP Trunk circuit pack provides a basic
twelve-port package that can be expanded up to a total of 30 ports. The number of ports
that are defined will correspond to the total number of simultaneous calls transmitted over
the IP Trunk Interface.
The benefits of IP Trunk include a reduction in long distance voice and fax expenses,
facilitating global communications, providing a full function network with data and voice
convergence and optimizing networks by using the available network resources.
233002_1.book Page 77 Monday, February 21, 2000 8:28 AM