3-way handshake needed because 1xx responses stop retries of INVITE. However, the ACK can also contain things such as an answer SDP.
> -----Original Message----- > From: [email protected] [mailto:sip- > [email protected]] On Behalf Of Vineet Menon > Sent: Monday, February 06, 2012 11:56 AM > To: [email protected] > Subject: [Sip-implementors] Significance of ACK in SIP > > Hi, > > I was wondering what is the significance of ACK in SIP? > > I mean can't the caller UA just send the media instead of the ACK > message? > This feature is present in H.323 too, so it might have some > significance! > Its just that im not able to get it.... > > > Regards, > > Vineet Menon _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
