[SIPForum-discussion] 183 Session Progress without SDP

nitin kapoor nitinkapoorr at gmail.com
Thu Apr 9 22:10:29 UTC 2009

Hello Manish,

Thanks for the response.

Do you have any docs where i can read something about this topic to clear my

Do you think this is the correct behavior.

Nitin Kapoor

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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