b66.cfg
b67.cfg - checking whether $fU and $tU are empty 
b68.cfg - one log line per loose-route requests and per non loose-route requests
b69.cfg - transaction line for ACK and CANCEL and new request line for new INVITEs 
b70.cfg - new labels: LooseR., Trans., Init.
b71.cfg - no R-URI for LooseR. and Trans. requests
b72.cfg - improved initialization of $var(fU) and $var(tU)