Nortel BCM 3.7, Manual

Page: 511 / 1004

Private network programming parameters 511
Programming Operations Guide
Lines used for networking
External (trunk) lines provide the physical connection between Business Communications
Manager and other systems in a private or public network.
The Business Communications Manager numbers physical lines from 061 to 233/240. Default
numbering depends on the trunk module positioning within the Business Communications
Manager.
Refer to “Explaining the Media Bay Modules headings” on page 136 .
VoIP trunks: Although a VoIP gateway does not require physical trunk lines, it is simpler to think
of them in the same way as actual trunk lines. Therefore, in the Business Communications
Manager, lines 001 to 060 are used for VoIP trunk functionality. Refer to the
IP Telephony
Configuration Guide for details about configuring VoIP trunks.
Business Communications Manager networking configurations that use PRI lines, require specific
modules, depending on the type of lines chosen.
• DTMs configured for PRI are used for incoming and outgoing calls (two-way DID). Incoming
calls are routed directly to a Business Communications Manager telephone. Outgoing calls are
made using the intercom button and dialing destination codes.
• DTMs configured for T1 have digital lines that are configured as Groundstart, E&M, Loop, or
DID.
Target lines are virtual communication paths between trunks and telephones on the Business
Communications Manager system. They are incoming lines only, and cannot be selected for
outgoing calls or networking applications. With target line
s , you can concentrate incoming calls on
fewer trunks. This type of concentration is an advantage of DID lines. Business Communications
Manager target lines allow you to direct each DID number to one or more telephones. VoIP trunks
also require target lines to direct incoming traffic. Target lines are numbered 241 to 492.
Telephones can be configured to have an appearance of any type of trunk and line or line pool
(including target lines, excluding PRI trunks which can only be configured into PRI line pools and
configured into routes with destination codes).
Other programming that affects private networking
Besides the line programming, these links connect to other programming that affect affects or is
affected by private networks.
• “Controlling access into the system” on page 293 (Received Number Length, Target lines and
remote access)
• “Configuring outgoing calls” on page 311 (dialing plans, access codes, routing, restrictions)
• “Assigning line access” on page 406 (Private OLI)
• “Network name display” on page 461
• “Setting outgoing name and number blocking” on page 486