The ALR cross references {TAIL ~ this URN} to find a URL for the target, such as the URL for the VLR 105 and contacts the VLR to start {HEAD ~ a session} with the target device 
The ALR cross references { TAIL ~ this URN } to find a URL for the target , such as the URL for the VLR 105 and contacts the VLR to start { HEAD ~ a session } with the target device
OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH