Patent ID: 8588390

Claim:
A call relay server comprising: a usage status management unit that, when a user starts using a system from a main terminal and a notification of starting is received from the main terminal and if a sub terminal related to the main terminal is registered, confirms the user via the main terminal whether to delete a registration of the sub terminal and, if a deletion instruction is received, deletes the registration of the sub terminal; a call control information storage unit that stores, for each user, a proxy phone number and terminal identification information on said main terminal and said sub terminal; and a call control unit that, when a call start request is received from a terminal, judges if the terminal is said main terminal or said sub terminal based on terminal identification information on a request source, establishes a call with said main terminal or said sub terminal and then makes a call to a call destination using the proxy phone number of the user, and forwards an incoming call, addressed to the proxy phone number, to said sub terminal if terminal identification information on said sub terminal is stored but, otherwise, forwards the incoming call to said main terminal.