Using The Mcdn Access Codes To Tandem Calls - Nortel BCM50 Configuration Manual

5 Set Absorbed Length to 1.
The digit 9 is only used internally and should be dropped. The 1 is needed to direct the call to
the public carrier network.
Tips: The destination codes 9 and 91 used in the examples cannot be
used together. If you need the destination code 91 to direct long distance
calls, you must create a separate set of codes that use local calling routes.
These codes would be, for example, 90, 92, 93, 94, 95, 96, 97, 98 and 99.
Refer to
information on programming destination codes.

Using the MCDN access codes to tandem calls

Three special access codes exist specifically for programming calls over PRI and VoIP trunks that
are using the MCDN protocol, and which connect to a call servers that use specific call codes for
special call types, such as the Meridian 1 (M1). The purpose of the codes is to allow easier
programming of the call servers when calls are tandemed through a BCM system to the local
PSTN. Refer to
with the private dialing plan.
This is how the codes relate:
Meridian 1 access codes
Network/long distance code Private access code
Local code
Calls tandeming to the public network through the private network need to retain their dialing
protocol throughout network. This means that a call from an M1 node tagged as a local call gets
received by the local node and is recognized as a call intended for the public network, but also as a
call that needs to maintain the local tag until it gets to the local 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 DN type. Refer to
route through a dedicated trunk" on page
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 DN type of Private.
Figure 80 charts the process for a call tandeming through a BCM to the local public network.
"Grouping destination codes using a wild card" on page 251
"Private Network Settings" on page 282
BCM access codes
National access code
Local access code
Special access code
Chapter 25 Dialing plan: Routing configurations
for a description of these fields in context
250.
for
Sample code
6
61
9
9
"Setting up a
Networking Configuration Guide
257