I have a scenario in which a UAC sends an INVITE and
then receives
a 180. The 180 includes a to header with a tag. After
the 180 is received
a "408 Request Timeout" final response is received.
The 408 final response
does have a to header tag.
I was under the impression that the UAS would send
the same to tag once
it sent the to tag. Without the to tag in the
408 final response the UAC cannot
tell if the 408 is from the same proxy or from a proxy
which received a forked
copy of the INVITE.
If the UAS sends the 408 with a tag it will be accepted
by the UAC even if
the 180 was never received by the UAC. This
would occur as the final response
would be the first response with a tag for the transaction.
Are there valid cases in which the UAC should accept
a subsequent response
without a to header tag once a response is received
with a to header tag?
--
Regards,
Doug Hurtig
Tekelec
2425 N. Central Expressway
Richardson, Texas 75080
[EMAIL PROTECTED]
972.301.1203
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