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
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Alex Balashov - Principal
Evariste Systems LLC
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On Jun 18, 2011, at 5:59 PM, Alex Balashov<abalas...@evaristesys.com> wrote:
On Jun 18, 2011, at 5:35 PM, Daniel-Constantin Mierla<mico...@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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