It is a requirement of the offer-answer model that re-invite with no SDP attribute return an offer. This offer can be the same as the original offer but it is a protocol error to return OK with no SDP body.
It is likely If you dig a packet capture or siptrace out you will see this. It would help a lot if you explained the call flow and UA's involved. This most likely occurs during hold or transfer. On Nov 23, 2012 4:51 AM, "Kemal Eroğlu" <[email protected]> wrote: > Hello, > > Recently I got an issue about sipxbridge and media relay in release-4.4. I > did some analysis, but stucked at some point. > > To summarize the problem, > > sipxbridge is ending some trunk calls with a BYE message that contains: > "sipxbridge;cause=204;text=Unexpected exception processing response" > (Calls are ended during call setup, generally before sending "Trying" to > the INVITE we received.) > > In sipxbridge log, the exception is: > RtpTransmitterEndpoint:"Unexpected exception " > org.sipfoundry.sipxrelay.SymmitronException: Error in processing request > Attempt to set transmitter but Receiver not set. > > Actually the exception occurs in media relay: > sipxrelay:"Exception setting destination " > java.lang.IllegalStateException: Attempt to set transmitter but Receiver > not set. > > After analyzing the logs, I saw that, while RTP session (bridge, > symmitrons, session) is being constructed in relay, somehow the > corresponding client transaction is terminated by bridge. This triggers > relay to delete the resources constructed so far. And then, relay tries to > achieve one of the deleted sources. (It attempts to set the transmitter of > a sym, but it is deleted) That gives the exception and the call is finished > by a BYE from sipxbridge. > > I could not find why the transaction is terminated, but in sipXbridge log, > this line is the initial point: > Timer-1:00000000:SipListenerImpl:"Transaction terminated event" > > Do you have any idea about this? > > Best Regards, > > -- > Kemal EROĞLU > Karel Electronics R&D Center > Cyberpark, Bilkent 06800 Ankara > +903122650290/3234 > > > _______________________________________________ > sipx-dev mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-dev/ > -- LAN/Telephony/Security and Control Systems Helpdesk: Telephone: 434.984.8426 sip: [email protected] Helpdesk Customers: http://myhelp.myitdepartment.net Blog: http://blog.myitdepartment.net
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