Since only International call is facing issue. So we can rule out RTP, RTCP protocol causing this issue. As he mentioned calls are working fine.1) No need to inspect wireshark traffic!!2) CUCM mostly causes this issue because of formatting and extens...
Check formatting of numbers which is implemented in CUCM is it in E.164 format!!! Since internally they are assigned extension ids but for internation call it should be terminated in E.164 format
