28 Feb
2007
28 Feb
'07
6:38 p.m.
Hi Michel,
my opinion is based on the following thinking. To solve your problem,
there are 2 ways:
1) approach openser developers to fix dialog module to cope with
bugy clients. The result will be something outside the RFC specs and
with a lot of penalties (note that the RR param is not only used for the
dialog matching but also for identifying what dialogs are monitored -
you can have dialog state only for calls going to PSTN for example and
you should not try process/match requests for the rest the calls)
2) approach the UAC vendors to fix the bug in their firmware. The
result is something full RFC compliant and with no penalties.
As I see, in both cases it is about approaching somebody for doing a
fix, but the outcome is different :)....
regards,
bogdan
Michel Bensoussan wrote:
Hi
"I think the best approach is to force the UAC vendors to align to the
SIP specifications."
Well..... Good luck.
I don't know why but I think if I call and tell them "get back all you
products and upgrade them to align to the SIP specification" they
won't listen to me. But may be I'm wrong.
Any way. I have to deal with it. Do you have some suggestions? What is
the best dialog module version to start with?
I'm not familiar with SIP but I understand that the "To" header won't
change during a session. Is that right? I'm not sure the "CallID" will
be them same in case of re-INVITE.
So I can save the "To" header in the dialog table and check it if the
rm_param is not found.
I'm not sure how to do this.
Andy, If you have some suggestions too...
Regards,
Michel.
Bogdan-Andrei Iancu wrote:
Hi Michael,
as you give you the same answer as to Andy :) :
"To be honest I'm not fan of complicating my life just to support
broken stuff :)....doing dialog matching in traditional way (without
using RR stuff) is very costly and since complete, un-altered RR
mirroring is mandatory by RFC3261, I see no point of doing it
different. "
I think the best approach is to force the UAC vendors to align to the
SIP specifications.
regards,
bogdan
Michel Bensoussan wrote:
Hi Bogdan
I'm agree with you, but we cannot control the UAS devices so we have
to handle the case it doesn't correctly mirror the RR header. Can we
base the dialog states on From and To headers? or Callid? I
understand the the rr_param is used for fast dialog matching (dialog
README). Checking dialog matching with headers (From, To, ...),
will consequently slowing the transaction?
Regards,
Michel.
Bogdan-Andrei Iancu wrote:
> Hi Michel,
>
> looking at the net capture, it seams that the UAS device
> (User-Agent: WLAN660-S VoIP PHONE) does not correctly mirror the RR
> header - it is removing the hdr parameters, mirroring only the URI,
> which is bogus.
>
> regards,
> bogdan