[pjsip] refresher INVITE destroys dialog

[RobertT]

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
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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