[Serdev] [Patch] Ability to check negative reply code in the failure_route

[Juha Heinanen]

dan,

my understanding is that the original invite transaction (and thus the
whole call_) will timeout when fr_inv_timer expires.  so if you find a
working gw and the callee does not answer, you will never have a chance
to try another gw after that provided that your gws' invite timeout is
not smaller than fr_inv_timeout.  

i'll experiment when i have time if someone doesn't confirm this sooner.

-- juha