Lines Overview - Nortel BCM50 Configuration Manual

Chapter 8

Lines overview

Telephony signals into the system, within the system, and out of the system are carried over
channels. For consistency, these channels are all called lines or trunks. This designation includes:
• circuit switched lines (PSTN): connect to the system through media bay modules
• Voice over IP (VoIP) trunks: connect through the LAN or IP network
• target lines, internal channels: connect PRI, T1 and VoIP trunks to specific devices
• intercom lines: connect all internal telephones together through the DN numbers, and allow
the user to access line pools for making outgoing calls, as well as being required for other call
features such as conference calling and system-wide call appearance (SWCA) calls. Intercom
designations are assigned in the DN record, or automatically by the system for each telephone.
Prerequisites
You must configure the media bay modules and/or the VoIP trunk parameters before you can set
up line programming.
• The position on the system bus of the trunk media bay modules determines the line numbers
that are available. See the Installation and Maintenance Guide (NN40020-302).
• The position on the system bus of the station media bay modules determines which DNs are
available, although DN numbers can be changed.
• Available VoIP lines are determined by the number of VoIP keycodes entered on the system
(between 01 and 12), starting with line 001 and ending at line 012.
See the following information:
• "Understanding how the system identifies lines" on page 90
• "Line record" on page 93
• "Line Job Aids" on page 94
Other line configuration options or requirements:
• BRI loops require configuration and provisioning before the BRI lines can be configured.
• The BCM50 does not support the DDIM (Digital Drop Insert MBM).
Networking Configuration Guide
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