Should the port be unavailable, {HEAD ~ the BRG} could interrupt {TAIL ~ the port}, reroute the call to an alternate port or take some other default termination procedure 
interrupt
Should the port be unavailable , { HEAD ~ the BRG } could interrupt { TAIL ~ the port } , reroute the call to an alternate port or take some other default termination procedure
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH