Problem with GSM gateway


I have Cisco Call Manager and GSM gtw configured as SIP trunk

When I call from inside to GSM, and GSM doesn't answer and I finish calling on VoIP phone, GSM mobile phone still ringing.

Or if GSM mobile drop a call, I can here a voice on VoIP phone that the connection with a calling number can 't be delivered.

When I call from GSM it works fine.

What could be a problem?


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