{HEAD ~ The adapter} then goes on {TAIL ~ hook} , terminating the call to the PBX 
goes on
{ HEAD ~ The adapter } then goes on { TAIL ~ hook } , terminating the call to the PBX
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH