How to be notified on Retransmission failure

Hi all,
I'm using Vovida 1.5.0 on Win32 Environment, but I think the same
problem should arise also on other platforms.
Suppose to create a Sip session with a peer, and then,
after BYE (or before/after other messages) unplug the network cable.
The Sip Stack (Transaction) retransmits the packets, but after not having
received response for that transaction, it stops retransmission.
But my application never gets any messages regarding that failure!

I think my application should be informed that the sent message
never got response: moreover I think I should not implement timer
at application level, because the Sip stack already (it seems to me)
manages that timers.

But why I never get informed? It's *really* important because I have
to clean up that calls. Nobody could help me regarding this issue?
Thank you.

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