10.56.3. Busy Override 
Line circuit parameter OVR
EB5/NAL line circuits must be released for busy override in the class
of trunk (COT) with the line circuit parameter OVR. The line circuit
parameter OVR should not be set for TFZ line circuits.
- You can expand the class of trunk for busy override as follows:
CHA-COT:COTNO=x,COTTYPE=COTADD,PAR=OVR;