I know this question has been asked a but of different ways but there always seems to be a slight different from what I need.
I have 2 Security System devices that run into some ATAs. The ATA are registered to my CUCM 9. Heres what I want.
I have a main line number of 945XXXX that all phones are seen as externally. I want to change that for these ATAs. Instead of being seen as the main line I want to see them at 955XXXX.
I have the Route List Use Calling Partys External Phone Number Mask to On. I then set the External Phone Number Mask on the DN on the ATA to 955XXXX. In the Calling Party Transform Mask ffield under the Route List I have my main line of 945XXXX.
However, the ATA is still seen as the main number when dialing out 945XXXX.
This could potentially be provider overriding. if you have a PRI and a Cisco Gateway, you could do a debug isdn q931, test the call and see what you are sending and if its different from what you receive, it will be provider based. If its a sip trunk and Cisco gateway, debug ccsip messages should help you.
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