[SIPForum-discussion] 183 Session Progress without SDP

[Manish Aggarwal]

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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