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46 Chapter 2 System telephony networking overview
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BCM systems can be networked together using T-1, PRI or VoIP trunks. PRI SL-1 lines and VoIP
trunks also offer the opportunity to use the MCDN protocol, which provides enhanced trunking
features and end-to-end user identification. If a Meridian 1 is part of the Nortel MCDN network,
the network can also provide centralized voice mail and auto attendant off the Meridian.
MCDN note: MCDN networking requires all nodes on the network to use a common Universal
Dialing Plan (UDP) or a Coordinated Dialing Plan (CDP).
Keycode requirements
Keycodes are required to activate the protocols that are used to create private networking,
including:
VoIP Gateway keycodes
an MCDN, DPNSS, or Q. Sig keycode, if you want to use a networking protocol between the
systems
You must purchase and install these keycodes before you can create a network. Consult with your
Nortel distributor to ensure you order the correct keycodes for the type of network you want to
create.
Remote access to the network
Authorized users can access TIE lines, central office lines, and BCM features from outside the
system. Remote users accessing a private network configured over a large geographical area can
avoid toll charges.
Lines used for networking
External (trunk) lines provide the physical connection between BCM and other systems in a
private or public network.
The BCM numbers physical lines from 061 to 238. Default numbering depends on the trunk
module positioning within the BCM.
VoIP trunks: Although a VoIP gateway does not use physical lines, it is easier to think of them
that way. Therefore, in the BCM, lines 001 to 060 are used for VoIP trunk functionality.
BCM networking configurations that use PRI lines, require specific DTM modules.
DTMs configured for PRI are used for incoming and outgoing calls (two-way DID). Incoming
calls are routed directly to a BCM DN that has a properly configured and assigned target line.
All outgoing calls made through PRI, are initiated using the destination codes.
Note: You cannot program a DISA DN or Auto DN to a VoIP trunk, as they
act as auto-answer trunks from one private network to the next. However, you
can configure VoIP line pools with remote access packages so that callers can
access telephones or the local PSTN on remote nodes on a tandemed network
that use VoIP trunks between systems.
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