Content delivery to a telecommunications terminal that is associated with {HEAD ~ a call} in {TAIL ~ progress} 
in
Content delivery to a telecommunications terminal that is associated with { HEAD ~ a call } in { TAIL ~ progress }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL