Hi there, thanks for your reply.
My client is truying to migrate call control traffic from ISUP to SIP and voice traffic to RTP.
The client is using Private addresses in its internal network, and this is what is happening:
1. The SIP trunk became up, but with some problems:
- Calls from the Client could be established, but the calls were mute (No RTP packet were sent from each direction)
- My client could not set up call to its partner, 503 status code (Service unavailable) was being received
Once I changed the client SBC to public address removing the need for NAT, everything worked just fine.
Any additional thoughts to what might be causing this problem.