Trunks And Trunk Groups - Avaya Communication Manager Administrator's Manual

Feature Reference

Trunks and trunk groups

Trunks and trunk groups
Trunks connect Communication Manager to other pieces of equipment (adjuncts) and to other switches.
In general, trunks connect te server to one of four things:
•
the public telephone network
•
a private telephone network
•
the Internet or a private intranet
•
switching adjuncts, such as a loudspeaker paging system or a source for music or announcements
When trunks of the same type are used for the same application, assign them to the same trunk group. A
trunk group allows you to assign service characteristics to the group rather than administering each trunk
individually.
NOTE:
Trunks and access endpoints consume the same resource. The sum of trunks and access
endpoints cannot exceed the total number of trunks allowed on your system.
This chapter contains information about the most common analog and digital trunks. Specialized trunks
such as Advanced Private-Line Termination (APLT), tandem, release-link, and DMI-BOS trunks are not
covered in this manual. See Overview for Avaya Communication Manager and Administration for
Network Connectivity for Avaya Communication Manager for information on these trunks.
Brief description
Avaya Communication Manager supports the following basic trunk types.
Access
Used in ETN, access trunks connect satellite servers/switches to the main server or switch. Unlike
tandem trunks, access trunks do not carry TCMs and thus allow satellite callers unrestricted access to
out-dial trunks on the main server/switch.
CAMA — Centralized Automatic Message
Accounting (E911)
CAMA trunks route emergency calls to the local community's Enhanced 911 systems and provide
CESID information to the system. Public Service Answering Points (PSAP) use CAMA trunks to
determine the caller's physical address.
NOTE:
Avaya does not recommend tandeming 911 calls.
1738 Administrator's Guide for Avaya Communication Manager
November 2003