I am facing issues with call forward in CUCM 11.5. In H323 gateway page i have changed calling party selection (outbound calls) to First Redirect Number (External). Calls coming from PSTN are forwarding to mobile (PSTN) if call is not answered.
However, my issue is when internal extension (501 - external mask is 22290501) calls to internal extension (504 - external mask is 22290504) caller id is showing 22290504 which is correct based on the First redirect number external. But the customer wants to see calling party mask (501 - 22290501) on PSTN mobile.
Any ideas how to achieve this without changing gateway settings (calling party selection).