About Trunks And Trunk Groups - Nortel Remote Office 9150 Installation And Administration Manual

Configuring the Remote Office 9150 unit

About trunks and trunk groups

Introduction
This section shows you how to configure your trunks to connect with the
MIG RLC at the host site, or to make calls through the local PSTN.
Trunks
A trunk is the straight connection between the PSTN and the Remote Office
9150 unit. Each ISDN BRI line (up to four are supported by the Remote Office
9150 unit) provides two B-channels. In Remote Office 9150 unit context, each
B-channel equals one trunk.
Each B-channel is defined as follows:
as a local trunk, remote trunk, or both
as a permanent or demand connection
Local trunk
The trunk is used to make local calls over the PSTN.
Remote trunk
A remote trunk is used to establish a connection to the MIG RLC from the
Remote Office 9150 unit.
Local and remote trunk
A B-channel that is defined as both local and remote can be used to make calls
through both the local PSTN, as well as through the MIG RLC on the host PBX.
Permanent versus demand connection
You can also specify whether the trunk connection will be a permanent or
demand connection.
A permanent connection means that the ISDN BRI B-channel connection
remains open all the time, and should only be used if a flat rate is being charged
for ISDN service. A demand connection means that the connection is opened
only when you need it.
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Standard 1.0
Remote Office 9150