Additional comments inline... Thanks & Regards, Nataraju A.B.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of thejeswara reddy Sent: Monday, January 16, 2006 1:15 PM To: VikramB; [email protected] Cc: [email protected] Subject: Re: [Sip-implementors] [Sip] sip transcation query hai vikram , ACK is considered as part of Transaction for non-2xx final responses. because Trasacation will not be considered as closed until the recepion of ACK , ensures the reliable delivery of non-2XX final responses to client. [ABN] 1. for transaction to complete the ACK is required for non-2xx whereas not required for 2xx response (soon after 2xx-to-INV received it would be terminated, hence no need to pass the ACK through those set of proxies which carried the INV)... (Also ACK for 2xx is required to complete the SDP negotiation than to complete the transaction state machine.) 2. All the entities involved in reaching the INV to target runs the transaction state machine (except stateless proxies) which need to completed gracefully by acknowledging the suitable ACK, hence the ACK for non-2xx of INV is hop-by-hop and would pass through all the proxies which carried INV. Hope this clarifies your doubt...? thanks theja "VikramB"<[EMAIL PROTECTED]> wrote: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hello All,</FONT></DIV> <DIV><FONT face=Arial size=2>   ; In rfc 3261 section 6 Definition </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2><STRONG> SIP Transaction : </STRONG></FONT></DIV> <DIV><STRONG><FONT face=Arial size=2>   ;   ; ...</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial size=2>   ;   ; ....</FONT></STRONG></DIV> <DIV><FONT face=Arial size=2><STRONG> &nb sp; &nb sp; </S TRONG> If the request is INVITE and the final response is a non-2xx, the transaction also<BR> includes an ACK to the response. The ACK for a 2xx response to an INVITE request is a separate transaction.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2> My query is why ACK is considered as a part of same transaction when in case of non-2xx response.?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>regards</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>VIkram</FONT></DIV></BODY></HTML> Get Your Private, Free E-mail from Indiatimes at http://email.indiatimes.com Buy The Best In BOOKS at http://www.bestsellers.indiatimes.com Bid for for Air Tickets @ Re.1 on Air Sahara Flights. Just log on to http://airsahara.indiatimes.com and Bid Now! _______________________________________________ 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
