The Dial Plan Transparency feature preserves dialing patterns of users when a gateway registers with a Survivable Remote Server (SRS) or Media Gateway and requests service from a Survivable Core Server (SCS).
When a gateway registers with a Survivable Remote Server, the Dial Plan Transparency feature routes calls over the Public Switched Telephone Network (PSTN) to connect endpoints that no longer connect over the corporate IP network.
Dial Plan Transparency does not work when two gateways are in the same network region.
For more information about administering
Dial Plan Transparency, see:
Avaya Aura® Communication Manager Feature Description and Implementation
Administering Network Connectivity on Avaya Aura® Communication Manager
Administering Avaya Aura® Communication Manager