Patent ID: 8229408

Claim:
A subsystem selection entity for a communication system that comprises: a first subsystem, a second subsystem and at least one terminal suitable for communication with said first and second subsystem, said subsystem selection entity being arranged for conducting a subsystem selection procedure that comprises making at least one subsystem selection decision associated with a subscriber terminating service involving said at least one terminal for selecting said first or said second subsystem for terminating said subscriber terminating service at said at least one terminal, said subsystem selection entity being arranged to perform a control procedure comprising at least one control operation for controlling how said first or second subsystem conduct a subscriber-not-reachable service, said subscriber-not-reachable service being conducted in the event that said subscriber terminating service cannot be terminated by the selected subsystem; sending a command for at least preliminarily not conducting a specific subscriber-not-reachable service to one or both of said subsystems; and sending a command to the subsystem selected in said subsystem selection decision, for instructing said selected subsystem to notify said subsystem selection entity if said terminal is not reachable by said selected subsystem.