Nortel BCM50 Configuration Manual page 233

Calls tandeming to the public network through the private network need to retain their dialing
protocol throughout the private network. This means that
M1 node tagged as a local call and recognizes the call intended for the public network, but also
recognizes the call that needs to maintain the local call tag until it gets to the BCM node that is
directly connected to the PSTN. This is accomplished by ensuring that the destination code, which
starts with this access code, passes the call on using the route designated with the correct call type.
Figure 70 charts this process.
Figure 70 Local call tandemed through BCM nodes
Dialout: 9-823-2222
The Meridian system recognizes the call as a local
public call.
Deletes the routing digits.
Tags call as Local call type
Sends out rest of dialout on private network
Dialout: <local call>-823-2222
The BCM Adds Local code to front of called
number: 9-823-2222
The system knows 9823 is the route to the next system and
routes the call through private network.
Calls coming in from the public network need to be translated to their private network destination
before routing/tandeming through the private network. In this case, the route used is defined with
the call type of Private.
Meridian user
Dialout: 9-823-2222
Chapter 24 Dialing plans
the
BCM node receives a call from an
The BCM receives the call. The system
recognizes 9823 as the destination code for the
local PSTN route. Route drops the leading digit
and dials out over the PSTN trunk.
Dialout: [unknown] 823-2222
Local
PSTN
Networking Configuration Guide
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823-2222