3 Aug
2007
3 Aug
'07
2:43 p.m.
From the answer below, Olaf and Samuel don't seem
to agree much ...
Let me attach some debug info, maybe you can see better through
it
than me. See attached files with debug corresponding to the first 200
OK and to the second ...
I would like to think that SER actually does as Samuel said ... after
the first 200 OK, all the other branches shall be automatically
cancelled, thus not giving the other callees the option of sending
more 200 OKs ...
On 8/3/07, samuel <samu60(a)gmail.com> wrote:
inline...
2007/8/3, Olaf Bergmann <Olaf.Bergmann(a)freenet-ag.de>de>:
I think it's not specified what to do when a UA receives a second 200
OK.... it can safely ignore it, it can present a mesage to the user, it can
try to mix the different audio streams, it can create a second dialog and
put the first on hold, and more options.
Try to look at HERP and "early media and forking" topics....
Hope I'm right though I think it should work "as it is" ;)
sam.
Cesc Santa wrote:
I think the proper forking behaviour is to send a CANCEL to all branches
upon receiving a 200 from one of them and I think that SER does this
automatically... isn't it??
I am doing some tests and it is not really a
problem ... but maybe
someone has a better idea. In my configuration, the first 200 OK
received is forwarded to the caller and the whole SIP session setup
(caller + 1st callee).
Next 200 OKs are also delivered to the caller,
That is the correct behavior of a SIP proxy. who
happily ignores them ...
That is broken behavior of a SIP UA. it is the
task of the 2nd (and 3rd, ... ) callee to at a
certain point give up and send a BYE, to which the caller replies with
481 no call leg ...
It all works ... but, I wonder if ser could send CANCELs after
receiving the 1st 200 OK ... if yes, how? :)
No, you cannot CANCEL an INVITE after having received a final
response. This must be done by the caller after having sent the ACK.
The UAC you have used is broken. The callee's UA tries to deal with
it and does the best it can. You should use a standards-compliant
SIP UA for your tests.