[SIPForum-discussion] Offer/Answer Model

[雨 陈]

Hi,
  According to the practical call flow, it seem the offer/answer model of SDP exchange can be found in INVITE/180, INVITE/200, 180/ACK or 200/ACK, even though the 180 response is provisional and sometimes the followed 200 OK send the same SDP Msg to confirm it.
   
  Regards
   
  Nora
  

vijay kant gupta <vijaykant.it2002 at gmail.com> 写道：
    See in Offer Answer Model. if u send invite without SDP at that time ACK has to contain SDP for A party.
But if INVITE conatin SDP then 200 ok is Answer for Invite 
ACK is final ACKNOWLEDGE.
  On Wed, Aug 20, 2008 at 3:54 PM, zabi <mohamed.zabiulla at gmail.com> wrote:
              Dear All,
   
      As per my knoweldge, Offer/Answer can occur in INVITE/2XX/ACK.
   
  Given a Sip message containing SDP how do we differentiate whether it is an OFFER/ANSWER??
   
   
  Regards,
  Zabi
   
   








-- 
why run? you'll only die tired!! 
Zabi.


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