Please see 17.1.1.3 of RFC 3261. The ACK MUST be sent to the same address, port, and transport to which the original request was sent.
A stateless UAS MUST ignore ACK requests. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of venkatesh chandran Sent: Tuesday, March 13, 2007 7:25 AM To: Sreenath Kulkarni Cc: [email protected] Subject: Re: [Sip-implementors] doubt regarding ACK for unsuccessful response Hi, For the stateless proxy the transaction layer will not be present,means it will not send the ACK request for failure response immediately? If PROXY1 and PROXY2 are stateless proxy then what will be the behaviour? Thanks, Venkatesh On 3/13/07, Sreenath Kulkarni <[EMAIL PROTECTED]> wrote: > > Hi, > > The responsibility of generating and sending the ACK request for > failure response is transaction layer. Any Sip Entity will have the > transaction layer implementation (Exclusive of state less proxy). And > transaction layer will stores the destination information with its for > that perticuler transaction. > > /Sreenath. > > ----- Original Message ---- > From: venkatesh chandran <[EMAIL PROTECTED]> > To: [email protected] > Sent: Tuesday, 13 March, 2007 12:51:28 PM > Subject: [Sip-implementors] doubt regarding ACK for unsuccessful > response > > Hi *, > I have query related to the ACK send for unsuccessful response. > ACK is send as hop by hop for the received unsuccessful > response.ieconsider the following scenario, > UA1----->PROXY1------>PROXY2------>UA2 > Now when UA2 send 486 busy then PROXY2 sends the ACK back to UA2 and > then forwards the 486 busy to PROXY1 and PROXY1 does the same. > How the proxy is able to generate a ACK in this case? and how it will > know that ACK has to send to that particular destination? > is it based on the source IP and port from where the message is received? > > > Pls clarify. > > Regards, > Venkatesh > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > ------------------------------ > Here's a new way to find what you're looking for - Yahoo! > Answers<http://us.rd.yahoo.com/mail/in/yanswers/*http://in.answers.yah > oo.com/> > _______________________________________________ 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
