Page 168 of 258 Dialing Plan configuration
On-net dialing plan
Note: The SRG only supports only one dialing plan option at a time. CDP and UDP dialing plan options cannot be configured at the same time in the same system.
The SRG supports the following dialing plans:
•Coordinated Dialing Plan (CDP) – BUID is the same as the Directory Number (DN)
•Uniform Dialing Plan (UDP) – Location code is added to the DN for the
BUID
Note 1: Nortel recommends that the SRG use CDP.
Note 2: CDP Terminal Numbers (TNs) can be activated on the other systems if the user moves and wants to retain their phone number. SRG does not support Transferable Directory Numbers (TNDN) due to differences in dialing plans and the small range of DNs available on the SRG.
For specific examples for CDP and UDP dialing plans, refer to “Dialing plan examples” on page 193.
Once the call is sent over the IP network, the call is routed to the SRG, which uses the NRS (H.323 Gatekeeper) to route the call. The NRS (H.323 Gatekeeper) translates the address form a telephone number to an IP address, and authorizes the call.
Specific dialing plan configuration is required for IP Phones to properly select a main office or a branch office that provides access to the PSTN for the originating IP Phone. A common configuration might be:
•SRG users select the SRG PSTN for local calls.
•Main office users select the main office PSTN for local calls.
•All users select either the main office or SRG PSTN for
•calls configured to minimize toll charges.
