Nortel Networks 9150 - Manual (Page 263)

Remote Gateway 9150 Installation and Administration Guide 233
January 2005 Configuring the Remote Gateway 9150 unit
Trunks
A trunk is the straight connection between the PSTN and the Remote Gateway
9150 unit. Each ISDN BRI line (up to four are supported by the Remote
Gateway 9150 unit) provides two B-channels. In Remote Gateway 9150 unit
context, each B-channel equals one trunk.
Each B-channel can be defined as a local trunk, remote trunk, or both.
Note: Remote Gateway 9150 unit support MSN. If each B-channel has a unique
DN then the configuration of the first B-channel defines both B-channels. For
more information on MSN, refer to “Multiple Subscriber Numbering (MSN)” on
page 13.
Local trunk
The trunk is used to place local calls over the PSTN.
Remote trunk
A remote trunk is used to establish a connection to the RLC from the Remote
Gateway 9150 unit.
Local and remote trunk
A B-channel that is defined as both local and remote can be used to place calls
through both the local PSTN, and the RLC on the host PBX.
Primary trunk on the Remote Gateway 9150 unit
The primary trunk on the Remote Gateway 9150 unit is one of the following:
!
the lowest-numbered B-channel defined as Remote only
!
the lowest-numbered B-channel defined as Local and Remote
A local call can cause blocking of an incoming host-controlled call on a B-
channel defined as Local and Remote, or prevent QoS transitions from
occurring. Therefore, Nortel recommends that you configure the primary trunk
as Remote only. For example, Module 4 first B channel.
Do not include the primary trunk in any trunk groups.