Christer,
.
Regarding from tags there is no explicit text, but 22.2 says:
When a UAC resubmits a request with its credentials after receiving a
401 (Unauthorized) or 407 (Proxy Authentication Required) response,
it MUST increment the CSeq header field value as it would normally
when sending an updated request.
So, I guess that means that the second INVITE in Dale's example should
have Cseq => 3.
I interpreted this as "MUST increment (relative to the INVITE being
challenged)". I guess for initial INVITEs the minimal requirement is
that the CSeq be different, else merged request detection (8.2.2.2)
could kick in and prevent the call from succeeding. So both 2 or 3 are
valid, the text is ambiguous
Regards,
Jeroen
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