Hi Ritul Is there any significance of this additional message for INVITE?
ACK for initial INVITE request makes sense as it may be useful for offer-answer when initial INVITE is without SDP and offer is received from called party in 200 OK. In that case ACK will send the answer. But what is the use of ACK for re-Invite message? Mayank On Fri, Nov 20, 2009 at 3:41 PM, Ritul Sonania <[email protected]> wrote: > > > > > Hi All > > > > I have a query regarding new offer-answer using Re-invite and Update > > methods. > > > > When a new offer is sent using a Re-invite, it is responded by 200 OK and > > then ACK for this 200 OK is sent. > > > > --------------------> Re-Invite (for new offer) > > <------------------- 200 OK > > --------------------> ACK > > > > However, if a new offer is sent using an UPDATE method, there is no ACK > > sent. > > > > ---------------------> UPDATE (for new offer) > > <--------------------- 200 OK > > > > My query is why there is no ACK sent for the 200 OK for update message. > > ACK is only sent for INVITE request. > > Regards, > Ritul Sonania > Niksun > > > > > Mayank > > _______________________________________________ > > Sip-implementors mailing list > > [email protected] > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
