o Properly handle exception parsing Contact header when NAT   traversal is enabled;
o Properly handle exception parsing Contact header when NAT
  traversal is enabled;

o set rtime member in the SipTransaction object always;

o revork INVITE transaction matching code. Instead of removing
  branch parameter for non-200 final replies and matching ACK
  to that branch-less transaction ID, use To tag in final reply
  to match ACK instead. This allows multiple transactions with
  the same From tag but different branch to be processed in
  parallel.

sippy/b2bua,AVOXI/b2bua,AVOXI/b2bua,sippy/b2bua