The ACK will not have a To-Tag, since proxies do not end To-tags to their responses (e.g. the 4xx you mentioned), but only the end points add them, thus the proxy will notice there is no To-tag in the ACK, and should realize this one is to be consumed by itself.
Uri ================================================================== SIPKnowledge, Inc. Email: [EMAIL PROTECTED]; Web: www.sipknowledge.com Tel: (847) 975 0393; Fax: (925) 476 9010; Mail: SIPKnowledge, P.O. Box 7298, Buffalo Grove, Illinois 60089-7298 "Learning that does not daily increase will daily decrease." - EWC ================================================================== ================================================================== Uri Baniel - Distinguished Member of Technical Staff - Motorola Tel: (847) 632 4616; Fax: (847) 632 3963; "Learning that does not daily increase will daily decrease. - EWC ================================================================== -----Original Message----- From: v l [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 13, 2003 2:33 PM To: [EMAIL PROTECTED] Subject: [Sip-implementors] proxy stateless Hi, A UA is in conversation with another UA over a SIP stateless proxy. Now if the UA sends a ill-defined INVITE (say max-fwd=0), and the sip stateless proxy responds with a 4xx response. Then the ACK sent for the 4xx response has the same Request URI as that in the INVITE. So how does the stateless proxy know that the ACK is meant for itself and should not be forwarded ahead. Thanks. __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
