Branch Office Dialing Plan - Nortel SRG200 Configuration Manual

Overview Page 33 of 254
In Normal Mode, the codec selection used is controlled by specific
programming of the CS 1000.
In Local Mode, if the WAN has failed, there are no longer any Virtual Trunks
available between the SRG and CS 1000. However, the SRG will continue to
convert calls from IP terminals for communication through the PSTN. Nortel
recommends you use G.711 codec.

Branch office dialing plan

Since IP Phone users can be located at a branch office equipped with an SRG,
the routing of calls to the local gateway is important (especially when toll
charges apply to calls made from the central Call Server that controls the
telephone). The administrator can configure digit manipulation through zone
attributes for IP Phones to select a main office or branch office that provides
PSTN access local to the destination of the call.
Calls from the PSTN to users within the network can be routed with the
various ESN numbering plan configurations.
To access local PSTN resources, outgoing calls can be routed using ESN as
well as zone parameters that enable digit insertion. The zone parameters force
calls made by an SRG user to be routed to the desired local PSTN facilities.
Outgoing calls can include local and, optionally, long distance calls.
Nortel recommends that the Branch User ID (BUID) be the same at the
branch office as the DN at the main office. A BUID has a maximum of 15
digits. Under the recommended Coordinated Dialing Plan (CDP), the BUID
can be an extension (for example, 4567). Under the Uniform Dialing Plan
(UDP), it is the user's main office DN, the Location Code (LOC), plus the
Access Code (for example, 6 343-5555).
The main office DN must be an ESN compliant DN. See "ESN Access
Codes" on page 34.
For more information about dialing plans and configuration, see "Dialing
Plan configuration" on page 49. For more information about the branch office
dialing plan, see the SRG200/400 Release 1.5 Configuration Guide.
Main Office Configuration for SRG200/400 Release 1.5 Configuration Guide