Nortel BCM 3.7, Manual

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Programming Operations Guide
Chapter 18
Configuring public networks
This section describes the ways of networking Business Communications Managers across a
public network. Different countries have different trunk types, therefore, these descriptions are
also region based. Refer to
“Media bay module availability by region” on page 837 for more
information.
This section includes information about:
• “Simple networking” on page 503
• “Dialing plans for T1 lines” on page 505
• “Destination code numbering in a network” on page 506
• “Other programming that affects public networking” on page 507
These are the protocols that the Business Communications Manager supports for public
networking:
• PRI: ETSI Euro, NI-2, DMS100, DMS250, and 4ESS
• DASS2
• BRI: ETSI Euro, NI-2
• T1: Loop
TIPS: Most of the diagrams in this section use the BCM1000. The BCM400 and BCM200 can be
used in any of these situations, as well. Keep in mind that the BCM200 only supports two PECs,
and, therefore, has less processing capacity than the other two units. This affects both networking
and IP telephony functions.
Simple networking
In the simplest form of networking, the Business Communications Manager acts as a routing
station between a private network and the public network, as shown in the following figure.
Figure 177 Connection to a private network
In the above example, there are three types of callers:
Each type of caller has a specific method of accessing the other two systems.
Private Network
Public Network
Business Communications Manager
T1 lines
Analog lines
PRI lines
E & M
PRI SL-1