The present invention relates to a communication system and in particular but not exclusively to {HEAD ~ a communication system} for {TAIL ~ use} in a push to talk over cellular network 
for
The present invention relates to a communication system and in particular but not exclusively to { HEAD ~ a communication system } for { TAIL ~ use } in a push to talk over cellular network
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH