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