> Assuming the original MESSAGE was sent out-of-dialog, as it typically > should have been, then there is no resulting route set for a return > message. You could try the Contact address, but it might not work. > > My expectation is that any message with a 2xx response creates a > dialog. After all, the response contains a Contact and zero or more > Record-Route headers, a to-tag, etc. > I second Dale's approach to send back MESSAGE to state the warning/failure/status text but I feel this UAS should not assume dialog to be there (unless MSRP). UAS should send MESSAGE to UAC on new dialog using contact, RR etc. etc. of received MESSAGE (from UAC).
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