[SIPForum-discussion] P-Early-Media and Offer-Answer Relation

ankur bansal abh.ankur at gmail.com
Fri Jun 14 10:34:03 UTC 2013

Hi All ,

I have come across one sceanrio :

Invite sdp(O1)---------------------->
183 sdp V1(A1) <----------------------
200 sdp V2 <-----------------------------
ACK ------------------------------------->

Here Sdp coming in 183 and 200 is same but server sending diff versions for
As offer answer is complete after 183 sdp ,how should we handle  200 sdp ?
  1. Assuming 200 sdp as new offer and send answer in ACK ?
  2. Ignore 200 sdp as offer answer already completed ?

Also note 183 is coming with P-Early-Media header .
Does P-Early-Media in 183 response gives us any flexibility regarding Offer
answer model or not ?

Thanks & regards
Ankur Bansal
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