> In the case that a reliable provisoinal response has been
> sent and a 200
> OK to the Invite also has been sent before receiving the
> Prack, will the
> timeout on Prack later on affect the call??? What is the RFC/Draft's
> intention?
In the above scenario, the PRACK MUST be
acknowledged with a response (last paragraph
section 6.2). If it is not, the UAC will have
to assume that a proxy or UAS is down; then
it is up to the UAC to decide how it wants to
handle such a situation.
A similar retry timeout race condition is
what should the UAS do when the 200 and
reliable 18x cross in delivery to UAC.
Last paragraph section 6.1 says that UAC
needs to send PRACK. However since a proxy
might be down; the PRACK might not get to UAS.
I assume that the UAS will not bring down
the call after 18x retry timeout after
already sent 200 and received ACK. However
I guess that it is ultimately the UAS's
choice since the UAC or proxy are down
and/or the 18x might be that important.
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