{HEAD ~ The radio communication unit} transmits {TAIL ~ a request} regarding availability of one or more specific radio communication services 
transmits
{ HEAD ~ The radio communication unit } transmits { TAIL ~ a request } regarding availability of one or more specific radio communication services
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH