Hi,
> would like to know what should the proxy server do if it receives a
> retransmission of INVITE message when it has already sent a
> 1XX response
> upstream (this happens when the 1XX response has not reached
> the UAC yet
> and hence the retransmission) - should it forward the INVITE message
> downstream or just discard it?
from rfc2543bis sec 10.3.1
A server which transmits a provisional response should retransmit it
upon reception of a duplicate request.
hope it answers your query.
Mayank
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