deriving one or more characteristics of a source voice transmission from {HEAD ~ a first communication device} in {TAIL ~ an originating network} 
deriving one or more characteristics of a source voice transmission from { HEAD ~ a first communication device } in { TAIL ~ an originating network }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL