I am running CUCM 6.X.
Current scenario is all phones are set to display their personal DID for external number mask.
The problem is with 911. Only the main number exists in 911 database, and telco will not add the other DID's.
How can I modify the 911 RP to present the main number, but have all other RP show the individual DID's?
On the route pattern for 911, uncheck allow external phone mask if checked. Then for the calling party transform mask specify the number to be displayed. That is it.