19 Jun
2011
19 Jun
'11
12:03 a.m.
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
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On Jun 18, 2011, at 5:59 PM, Alex Balashov <abalashov(a)evaristesys.com> wrote:
On Jun 18, 2011, at 5:35 PM, Daniel-Constantin Mierla
<miconda(a)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.
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