On 6/19/11 12:03 AM, Alex Balashov wrote:
My understanding is that the deficiency in the standard here is that B is not required to copy RR headers into provisional responses, only final ones.
indeed, if 183 does not copy record-route headers is not much to do in A side -- I expected that any 1xx reply apart of 100, and especially 183 to mirror record-route headers. I searched a bit and in several cases I could spot, the 183 had the R-R headers.
So the fault would be now in B, but if there is no _MUST_ for 183 to mirror R-R, then it is in IETF WG :-) ...
Maybe you can fix it via Kamailio configuration file: - if there is no R-R header in 183 and you know it is going to be a bridged call (via some flag set or a special onreply route), then insert the headers manually with append_hf(R-R: sip:ip1;lr\r\nR-R: sip:ip2;lr\r\n");
Then see if A is following the R-R.
Cheers, Daniel
-- Alex Balashov - Principal Evariste Systems LLC 260 Peachtree Street NW Suite 2200 Atlanta, GA 30303 Tel: +1-678-954-0670 Fax: +1-404-961-1892 Web: http://www.evaristesys.com/
On Jun 18, 2011, at 5:59 PM, Alex Balashovabalashov@evaristesys.com wrote:
On Jun 18, 2011, at 5:35 PM, Daniel-Constantin Mierlamiconda@gmail.com wrote:
iirc, the PRACK should follow the record-routing as part of its early dialog state. At least, from my experience the PRACKs I saw so far were sent to the proxy address due to record routing, not directly to contact address in 183. Without following the record routing, I see no way to go even for cases with NAT. For me looks like A is buggy, but I haven't checked actually the specs at this time.
Daniel,
Sorry, perhaps I was not clear. A is a softphone initiating a call through Kamailio. Kamailio forwards the call to UAS B with Record-Route header added, and UAS B sends 183s back to A through Kamailio, with 100rel Require'd. There are no RR headers seen by A, and so it does not know to send PRACK to something but the Contact in the 183. _______________________________________________ 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
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