[SIPForum-discussion] Early Media Call flow

[Dimitris Bourdoukis]

Hello

The offer/answer has been completed on 200OK(PRACK). So, in principle  I
would expect an UPDATE request after the 200OK(PRACK) to change the session
attributes with a new offer. The SDP in the 200OK(INVITE) should be either
ignored or make the SDP invalid in the above case.

Please consult also:
http://tools.ietf.org/html/draft-ietf-sipping-sip-offeranswer-13

BR
Dimitris


On Thu, May 7, 2015 at 1:04 PM, Kamal Kandpal <kamal.kandpal88 at gmail.com>
wrote:

> *Hi All ,
> **I have come across one sceanrio :*
>
> *Invite sdp(O1)---------------------->
> **183 sdp V1(A1) <---------------------- PCMU codec , Audio port 2000*
>
> *Prack --------------------- >*
>
> *200 <----------------------
> **200 sdp V2 <---------------------------PCMA codec , Audio port 5000
> **ACK ------------------------------------->
> **Here Sdp coming in 183 and 200 is completely different and coming from different user Agent over same Call-id.*
>
> *As offer answer is complete after 183 sdp ,how should we handle 200 coming with different sdp ?
> **1. Assuming 200 sdp as new offer and send answer in ACK ?
> **2. Ignore 200 sdp as offer answer already completed ? *
>
> *As per RFC 6337 SDP should not be included in subsequent response once offer answer has been completed.*
>
> *Thanks*
>
> *Kamal*
>
>
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20150513/48f00c85/attachment-0002.html>