Just to confirm:Kamaili is forwarding the PRAK packet. However, it seems the kamailio ignore the Cseq increase within the PRAK and therefore it ignore the 200 Ok after that. Then, Kamailio re-send 180 again. Thank,AS > Date: Mon, 13 May 2013 11:41:09 -0400 > From: abalas...@evaristesys.com > To: sr-users@lists.sip-router.org > Subject: Re: [SR-Users] Does Kamailio support PRACK ? > > PRACK is an in-dialog/sequential request, which will be relayed like > other. So, Kamailio relays it in the same way that it supports any > sequential request. Is it not necessary for a SIP proxy to do anything > specific to support PRACK. > > The UAC should not be increasing the CSeq when sending a PRACK. My > guess is that it is the UAS which doesn't like it, rather than > Kamailiio. From RFC 3262 Section 3 ("UAS Behavior"): > > A matching PRACK is defined as one within the same > dialog as the response, and whose method, CSeq-num, and > response-num in the RAck header field match, respectively, > the method from the CSeq, the sequence number from the CSeq, > and the sequence number from the RSeq of the reliable > provisional response. > > -- Alex > > On 05/13/2013 11:37 AM, Alex Solt wrote: > > > Hi, > > > > Does kamailio support PRACK method ? Any configuration change is needed? > > It appears Kamailio does not like the PRAK when increasing Cseq. > > Here is the call flow: > > > > A send INVITE --> Kamailio --> proxy the packet to B > > B send 180 Ringing --> Kamailio -> proxy the packet to A > > A send PRAK (increase Cseq) --> Kamailio --> proxy the packet to B > > B send 200 OK --> Kamailio -> proxy the packet to A > > Kamailio re-send 180 Ringing to A > > > > > > Thanks, > > AS > > > > > > > > _______________________________________________ > > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > > sr-users@lists.sip-router.org > > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > > > -- > Alex Balashov - Principal > Evariste Systems LLC > 235 E Ponce de Leon Ave > Suite 106 > Decatur, GA 30030 > United States > Tel: +1-678-954-0670 > Web: http://www.evaristesys.com/, http://www.alexbalashov.com/ > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
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