The accessor location register 4 herein said controller contacts a visitor location register corresponding to said second URL for {HEAD ~ information} relevant to the communications unit in order to initiate said third contact attempt and to cause said visitor location register to start {TAIL ~ a session} with the communications unit 
The accessor location register 4 herein said controller contacts a visitor location register corresponding to said second URL for { HEAD ~ information } relevant to the communications unit in order to initiate said third contact attempt and to cause said visitor location register to start { TAIL ~ a session } with the communications unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH