[SIPForum-discussion] 183 Session Progress without SDP

[Sunny]

Maybe the UAS is a B2BUA?  Hum...


2009/4/10 Tomasz Zieleniewski <tzieleniewski at gmail.com>

> Hi All,
>
> I totally agree with Manish,
> One more thing that came to my mind was that
> gateway by sending this first 183 ASAP could assure that if for any
> reason originating UAC on the whole sip downstream
> path didn't receive the 100 trying response this will cause that this
> INVITE transaction will move to Proceeding state and there would
> no retransmissions.
>
> Cheers
> - Tomasz Zieleniewski
>
> 2009/4/9 Manish Aggarwal <maaggarwal at gmail.com>:
> > Multiple provisional responses is allowed as per the protocol spec.
> > This can be used to create an early dialogue.
> >
> > A UAS will send this, when its taking long time to process INVITE (and
> > before sending 200 OK).
> >
> > Have heard of this behavior before though.
> >
> >
> > -Manish
> >
> > On Thu, Apr 9, 2009 at 12:26 PM, nitin kapoor <nitinkapoorr at gmail.com>
> > wrote:
> >>
> >> Dear All,
> >>
> >> We are facing one problem where we are getting two 183 session for 1
> >> INVITE. UAC sending the INVITE to Switch and switch has forwarded the
> same
> >> invite to UAS. Then UAS first send the 183 Session progress without SDP
> and
> >> after 2 Sec its sends the another 183 Session Progress with SDP which is
> >> something i am not able to understand.
> >>
> >> 1) Can you please tell me on which cases UAS sends the two 183 Session
> >> progress like this.( with SDP & without SDP)?
> >> 2) Is this the correct behaviour?
> >>
> >> I checked this on RFC3261 and another sip pdf but unable to search it.
> >>
> >> Please find the attached Traces.
> >>
> >> Thanks
> >> Nitin Kapoor
> >>
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> >
> >
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> >
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-- 
Thanks

Sunny
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