[Devel] CANCEL retransmission

[Bogdan-Andrei Iancu]

Hi Martin,

thanks for report - indeed, it seams to be a problem - I was able to 
reproduce the scenario. I will start working on it, but it will be 
better if you also open a new bug report on the tracker.

Thanks and regards,
bogdan

Martin Koenig wrote:

>Hello all,
>
>in the given scenario, a CANCEL-message is t_relay()-ed to the next hop user
>agent in transport UDP, and the target agent does not to it. However,
>openser is not re-transmitting the cancel message:
>
>#
>U 2006/05/30 10:35:14.928141 USERAGENT-A:5060 -> OPENSER:5060
>CANCEL sip:+4972166360 at OPENSER:5060;user=phone SIP/2.0.
>Via: SIP/2.0/UDP
>USERAGENT-A:5060;branch=z9hG4bK-b42132959a0eaae2d4f43ba197d4c249;rport=5060.
>From: <sip:username at toplink-voice.de>;tag=1548336820.
>To: <sip:+4972166360 at toplink-voice.de;user=phone>.
>Call-ID: 0e4b8c8e at pbx.
>CSeq: 2 CANCEL.
>Max-Forwards: 68.
>Contact: <sip:username at USERAGENT-A:5060;transport=udp>.
>Content-Length: 0.
>.
>
>#
>U 2006/05/30 10:35:14.928806 OPENSER:5060 -> USERAGENT-B:5060
>CANCEL sip:+4972166360 at USERAGENT-B:5060;user=phone SIP/2.0.
>Via: SIP/2.0/UDP OPENSER;branch=z9hG4bK5ef1.bea7a8f6.0.
>Via: SIP/2.0/UDP
>USERAGENT-A:5060;branch=z9hG4bK-b42132959a0eaae2d4f43ba197d4c249;rport=5060.
>From: <sip:username at toplink-voice.de>;tag=1548336820.
>To: <sip:+4972166360 at toplink-voice.de;user=phone>.
>Call-ID: 0e4b8c8e at pbx.
>CSeq: 2 CANCEL.
>Max-Forwards: 67.
>Contact: <sip:username at USERAGENT-A:5060;transport=udp>.
>Content-Length: 0.
>.
>
>#
>U 2006/05/30 10:35:14.928835 OPENSER:5060 -> PROXY-B:5060
>SIP/2.0 200 canceling.
>Via: SIP/2.0/UDP
>USERAGENT:5060;branch=z9hG4bK-b42132959a0eaae2d4f43ba197d4c249;rport=5060.
>From: <sip:username at toplink-voice.de>;tag=1548336820.
>To:
><sip:+4972166360 at toplink-voice.de;user=phone>;tag=54438713ac33febc84bf508cca
>f41100-cfc5.
>Call-ID: 0e4b8c8e at pbx.
>CSeq: 2 CANCEL.
>Content-Length: 0.
>.
>
>The second cancel is the only cancel ever that openser will send out. I
>believe it should start re-transmission of the cancel message after 500ms,
>then 1000ms etc. Is this a known issue?
>
>Best regards,
>Martin
>
>
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