Retransmission of INVITEs

Hi,

	Whilst refreshing my knowledge of retransmission I came across a problem I thought had been resolved, and
yet can't find it in the SIP archives. Retransmission of INVITEs cease upon receipt of provisional
responses (the reliability of final responses is left to the server transaction), however, this
introduces a problem for 100 responses (not generic 1xxs). The problem is a UAC sends an INVITE, a proxy
responds with 100 and then promptly dies. The UAC has ceased retransmission of the INVITE waiting for a
response that'll never come. My favoured solution would be for 100s to INVITEs to step the retransmission
to T2 and have non 100 provisional responses stop retransmission. Anyway is this a non problem / stupid solution?

James

P.S. I am far less concerned about proxy failure once the request has actually reached the UAS, so ignored that.
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