Separately using the URN {TAIL ~ the ALR} contacts {HEAD ~ the HLR} to make a validity check 117 of the URL 
Separately using the URN { TAIL ~ the ALR } contacts { HEAD ~ the HLR } to make a validity check 117 of the URL
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH