[SR-Users] 100rel without direct reachability

[Alex Balashov]

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.

--
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 Balashov <abalashov at evaristesys.com> wrote:

> On Jun 18, 2011, at 5:35 PM, Daniel-Constantin Mierla <miconda at 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 at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users