Nortel Networks Remote Gateway 50 manual Zone-based digit manipulation

Dialing Plan configuration Page 171 of 258

Zone-based digit manipulation

For SRG users in Normal Mode, it may be desirable to provide routing that is different from that provided to main office users. For example, it may be desirable to route certain calls directly to the SRG PSTN trunk, rather than receive the same routing as non-SRG users in the main office.

To achieve this, the Zone Access Code Behavior (ZACB) and Zone Digit Prefix (ZDP) properties of the branch office zone are used to add digits to the digits dialed by the SRG user. The resulting digit string is then used to route the call. The net effect of this is that an SRG user’s and a main office user’s call can be routed differently, even though the dialed digits were the same.

For example, if “1 87654321” is dialed, where “1” is the Access Code, then:

•for a main office user, the call is routed based on the dialed digits.

•for an SRG user, the digits undergo zone-based digit manipulation (such as inserting “101”), and the call is routed based on the new manipulated digit string (in this example “1 101 87654321”).

By performing this zone-based digit manipulation, calls from main office users and SRG users undergo different routing. Some applications are:

•routing all SRG users’ calls to the SRG PSTN trunk

•routing SRG users’ local calls to the SRG PSTN trunk

•routing all SRG users’ calls to the main office PSTN trunk

•routing SRG users’ long-distance calls to the main office PSTN trunk

Special considerations apply in the case where a single Access Code is used for both on-net and off-net calls, especially when UDP is used. Routing of on- net and off-net calls is normally different. The Call Server ESN Special Number provisioning (refer to Note 1 on page 182 and Note 2 on page 182) and Gatekeeper Numbering Plan Entry provisioning (refer to the note on page 187) should be used to provide this different routing.

In the case where a single Access Code is not shared, that is, where one Access Code is exclusively used for UDP on-net dialing, standard procedures should be used. Refer to Dialing Plans: Description (553-3001-183).

Main Office Configuration for Survivable Remote Gateway 50 Configuration Guide