Hi All,
We configured a GSM Gateway on the Call Manager via SIP Trunk.
I believe the configuration on Call Manager side is fine SIP Profile/Security Profile and SIP Trunk that pointed to IP Address of the GSM Gateway. However every time we dial, busy tone was always the result. As per checking on the gathered CMTrace, the CUCM is responding SIP 403 Forbidden Q.850 Cause Code 21. Could you help to analyze the CM Trace.
Please see attached CM Trace File.
===========================
Calling: 4998
Called: 09175118768
Time Stamp:
6:22
6:23
6:25
6:26
Thank you in advance