We have users at a remote site that, when they receive a call from the PSTN where the last 4 digits of the calling party number matches an existing extension defined in CallManager, it appears on the phone as an internal call.
Existing CCM extension: 1927 (Display name - Mary)
PSTN - Calling party number: 4105551927
The internal user will see a call from 4105551927 as "call from Mary" and think it is a coworker. Also, if the internal user does not pickup and it forwards to voicemail it will say "message from Mary".
I ran a debug and I see the call come into the MGCP gateway with the full 10 digits. There are no applicable translation patterns that match that would shorten the calling party number to 4 digits.
Has anyone seen this before?