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Transfer function of a telephone system

  • US 8,331,349 B2
  • Filed: 03/23/2005
  • Issued: 12/11/2012
  • Est. Priority Date: 07/13/2004
  • Status: Expired due to Fees
First Claim
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1. A SIP telephone system to secure user'"'"'s personal mobility, the system comprising a plurality of SIP telephone terminals, a switching device connected to the SIP telephone terminals via a communication network, and a SIP server connected to the communication network, wherein the SIP telephone system manages a log-in/log-out state at the plurality of SIP telephone terminals, and wherein:

  • the switching device comprises a transfer section for transferring an incoming call with a destination of a first SIP telephone terminal, on which a user has logged in and in which a transfer function is set, to a second SIP telephone terminal at a transfer destination, andthe SIP server comprises;

    an internal timer for counting time; and

    a releasing section, wherein;

    the releasing section releases the setting of the transfer function when the internal timer counts a first predetermined time after completion of the setting of the transfer function;

    the releasing section releases the setting of the transfer function when the internal timer counts a second predetermined time after termination of the incoming call at the second SIP telephone terminal;

    the releasing section releases the setting of the transfer function when the user logs in a second time on the first SIP telephone terminal or logs in on a third SIP telephone terminal other than the first and second SIP telephone terminals; and

    the releasing section releases the setting of the transfer function when a new transfer destination is set at a fourth SIP telephone terminal other than the first and second SIP telephone terminals, the new transfer destination being a destination other than the second and fourth SIP telephone terminals.

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