signaling said PBX to connect said {HEAD ~ adapter} through said PBX to said {TAIL ~ voice message system}, 
signaling said PBX to connect said { HEAD ~ adapter } through said PBX to said { TAIL ~ voice message system } ,
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH