The gateway receives an INVITE with a tag in the "To:" header, but can't find an existing dialog (=call-id + to-tag + from tag) to this INVITE. The gateway doen't treat the INVITE as the beginning of a new dialog, because the TO-tag is already present. I think SIPPS should not use the to-tag recevied by ser in the second INVITE, as a 4xx respond does not create a dialog. regards, Klaus -----Original Message----- From: Greg Fausak [mailto:greg@august.net] Sent: Tue 12.08.2003 22:33 To: 'SER Users' Cc: sip(a)addaline.com Subject: [Serusers] SIPPS UA I've been trying to get the SIPPS UA working with My addaline.com setup. I keep getting the error: SIP/2.0 481 Call Leg/Transaction Does Not Exist. No matter what the far end is. I am able to call this UA from anywhere After it registers. Anybody have any ideas? Here is the an example call flow: http://www.addaline.com/traces/sipp_index.html The only thing I notice that is weird is the 'Route' in the F4 packet. ---greg Greg Fausak _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers