[reSIProcate] about failover!

[hongsion]

Hi all,
	According to RFC3263 4.3, when timer B times out, UA should
reconstruct new transaction and send request. But from TransactionState.cxx,
when Timer B is time out, seems only 408 response sent to Transaction user,
no continue action is done. Please check. Also, when failure occurs, should
create new request with different branch ID, seems in TransactionState::
processTransportFailure, only original request is sent, I am referring resip
1.4.1 version.

Regards,
/hongsion