Dialing Plan configuration Page 169 of 258
However, this configuration represents only one way that the dialing plan could be configured. PSTN calls can be routed according to the point of origin (main office or branch office) and/or the desired destination, and can select trunks at the main office, branch office, or other branch offices as required. Therefore, the user can route calls to gateways that minimize
Nortel recommends that customers use Coordinated Dialing Plan (CDP) between the main office and its branch offices since it enables all users, at the main office or the branch office, to call each other using just an extension number. CDP enables consistent dialing between the main office and SRG IP Phones and devices.
For more information, refer to Dialing Plans: Description
Off-net dialing plan
When dialing to the PSTN, the Call Server determines that the call destination is
If routed over a Virtual Trunk, a request is sent to the NRS to determine the location of public E.164 numbers. The NRS is configured with a list of potential alternate routes that can be used to reach a certain dialed number. Each route is configured with a unique “route cost” to determine the
The NRS replies with the address information for E.164 numbers. It also provides a list of alternative NRS (H.323 Gateway) endpoints, sorted by cost. If a terminating endpoint resource is busy when a call attempt is made, the originating endpoint tries the next alternative. If no alternative is available over the IP network, the originating endpoint steps to the next entry on its route list, which could be a TIE or PSTN alternate route.
Main Office Configuration for Survivable Remote Gateway 50 Configuration Guide
