I am facing issue with call forwarding. Our internal range is different to the external range.
Internal range is 51XX and external is 8792249XX.
When I try to call the mobile/external number directly it works but when calling it after putting the number to CFNA it givess the error message. I tried DNA and it shows fine. I think it's failing somewhere in dial-peers and translation patterns.
I was able to resolve. Looked deeper into the debugs and found we were sending the wrong calling number and SP was denying it. Corrected that by adding tranlation patterns on calling party and it resolved the issue.