As an overview whenever an originating unit, such as {TAIL ~ device A} 107 wishes to contact {HEAD ~ a target device}, such as device C 111, a local ALR 113 is accessed 115 with the target device URN 
As an overview whenever an originating unit , such as { TAIL ~ device A } 107 wishes to contact { HEAD ~ a target device } , such as device C 111 , a local ALR 113 is accessed 115 with the target device URN
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH