[SIPForum-discussion] 183 Session Progress without SDP

nitin kapoor nitinkapoorr at gmail.com
Thu Apr 9 17:26:54 UTC 2009

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.

Nitin Kapoor
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20090409/64142006/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: New Traces.pcap
Type: application/octet-stream
Size: 135511 bytes
Desc: not available
URL: <http://sipforum.org/pipermail/discussion/attachments/20090409/64142006/attachment-0002.obj>

More information about the discussion mailing list