- Blue, 1500 points or more
I'm having a problem with CUBE (152-1.T) & Microsoft OCS:
For national calls, the SIP call sets up fine. For international calls, as soon as the user has finished dialling, OCS gives an N/U.
Looking at the SIP messages, the main difference is that for National calls, we get a SIP INVITE, and then send a SIP TRYING, followed by a SIP RINGING.
But for International calls, we get a SIP INVITE, send a SIP TRYING, then fairly quickly afterwards, we send a SIP 183 Session Progress. After that, everything goes quiet. We get nothing from OCS, and we send OCS nothing.
I'm guessing that OCS is chocking on the 183 Session Progress.
Thoughts or suggestions ?