According to the system, the server {HEAD ~ means} is arranged to detect {TAIL ~ an anonymity request} from the first user equipment and, responsive to the anonymity request, to prevent the second user equipment from identifying the first user equipment from user plane messages transmitted from the first user equipment to the second user equipment 
is arranged to detect
According to the system , the server { HEAD ~ means } is arranged to detect { TAIL ~ an anonymity request } from the first user equipment and , responsive to the anonymity request , to prevent the second user equipment from identifying the first user equipment from user plane messages transmitted from the first user equipment to the second user equipment
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH