I register 2 IP Communicator to the CCM 5.0.4.. From CCM is connected (SIP trunk) to Xener SoftSwitch that have to Voice gateway to PSTN and Internet Carrier. My IP Phones can call to national PSTN, but to international call via Internet Carrier Phone is failed.
My questions are:
1) Is it related to incoming port in SIP security profile or destination port in SIP trunk?
2) Is it related to MTP or DTMF?
3) FYI, the softswitch require SDP to be invited to it from CCM, and from the RTMT log, there are no "INVITE SDP". How to enable the "fast start" or "early offer"?