Henning Westerholt writes:

> I think in this particular case (SIP authentication) this is not
> correct  (RFC 3261, 22.2):
>
> "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."

OK then, reference to this exception should have been included in
section 8.1.1.5.

-- Juha