[pjsip] refresher INVITE destroys dialog

[David Clark]

Thanks for the detailed logs:
First off I don't think reconnecting the conference port will do much 
here.  I think the problem is here:
Session-Expires: 120;refresher=uas
Min-SE: 120
I would look for why that happens and see what I could make of 
that.  Might also try going to version 1.4 and
see if the problem exist there.  Sorry couldn't be of more help.

At 01:02 AM 10/2/2009, RobertT wrote:
>Hi guys!
>
>I've encountered a problem with refresher INVITE message.
>In short it breaks established call, causing media transport to 
>close, but the session itself is OK. Here is an example:
>I've got an application calling into the conference server. This 
>server accepts the call and establishes the connection. This client 
>can hear the sound coming from server form about a minute, after 
>that the sound suddenly breaks and neither he hear anything nor he 
>can be heard by other participants of conference. Below is a short 
>piece of sip trace:
>
>INVITE sip:1.conference.dw at xx.xxx.x.xx:5080;transport=TCP SIP/2.0
>..
>
>SIP/2.0 100 Trying
>..
>
>SIP/2.0 407 Proxy Authentication Required
>..
>
>ACK sip:1.conference.dw at xx.xxx.x.xx:5080;transport=TCP SIP/2.0
>..
>
>SIP/2.0 100 Trying
>..
>
>SIP/2.0 183 Session Progress
>..
>
>This is the answer from server with refresher lines in SDP
>SIP/2.0 200 OK
>..
>Session-Expires: 120;refresher=uas
>Min-SE: 120
>..
>
>ACK sip:1.conference.dw at xx.xxx.x.xx:5080;transport=tcp SIP/2.0
>..
>
>Finally, the next INVITE message from server causes media stream to close
>Processing incoming message: Request msg INVITE/cseq=121095711 
>(rdata07810910)
>RX 978 bytes Request msg INVITE/cseq=121095711 (rdata07810910) from 
>tcp xx.xxx.x.x:5080:
>INVITE sip:1001 at 87.184.52.45:64935;transport=tcp SIP/2.0
>...
>Session-Expires: 120;refresher=uac
>Min-SE: 120
>..
>
>...
>m=audio 27322 RTP/AVP 103 101
>a=rtpmap:103 speex/16000
>a=rtpmap:101 telephone-event/8000
>a=fmtp:101 0-16
>a=silenceSupp:off - - - -
>a=ptime:20
>
>dlg0783D1AC  Received Request msg INVITE/cseq=121095711 (rdata07810910)
>tsx07845D7C  Transaction created for Request msg 
>INVITE/cseq=121095711 (rdata07810910)
>tsx07845D7C  Incoming Request msg INVITE/cseq=121095711 
>(rdata07810910) in state Null
>tsx07845D7C  State changed from Null to Trying, event=RX_MSG
>dlg0783D1AC  Transaction tsx07845D7C state changed to Trying
>inv0783D1AC  Got SDP offer in Request msg INVITE/cseq=121095711 
>(rdata07810910)
>Call 0: received updated media offer
>endpoint  Response msg 200/INVITE/cseq=121095711 (tdta07846520) created
>inv0783D1AC  SDP negotiation done, status=0
>Call 0: remote NAT type is 0 (Unknown)
>
>strm0784C834
>JB summary:
>    size=2 prefetch=3
>    delay (min/max/avg/dev)=20/260/55/50 ms
>    burst (min/max/avg/dev)=1/12/2/0 frames
>    lost=35 discard=0 empty=852
>
>Media session for call 0 is destroyed
>pjmedia_rtp_session_init: ses=0784D580, default_pt=103, ssrc=0xd291c26
>pjmedia_rtp_session_init: ses=0784D9F4, default_pt=103, ssrc=0xd291c26
>Stream strm0784C394 created
>Encoder stream started
>strm0784C394  Decoder stream started
>Media updates, stream #0: speex (sendrecv)
>
>inv0783D1AC  Sending Response msg 200/INVITE/cseq=121095711 (tdta07846520)
>dlg0783D1AC  Sending Response msg 200/INVITE/cseq=121095711 (tdta07846520)
>tsx07845D7C  Sending Response msg 200/INVITE/cseq=121095711 
>(tdta07846520) in state Trying
>TX 801 bytes Response msg 200/INVITE/cseq=121095711 (tdta07846520) 
>to tcp <http://74.208.167.44:5080>74.208.167.44:5080:
>SIP/2.0 200 OK
>...
>
>Any help regarding how to resolve this problem will be appretiated!
>
>Cheers, Robert.
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