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Call reservation technique for a subscriber of another exchange utilizing a no. 7 signal

  • US 5,933,485 A
  • Filed: 12/04/1996
  • Issued: 08/03/1999
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Term
First Claim
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1. A call reservation method of a first exchange serving a call of an outgoing subscriber and a second exchange serving a call of an incoming subscriber, comprising the steps of:

  • outputting a message requiring a call reservation registration from said first exchange to said second exchange at the time of reserving said call;

    storing call reservation information in said second exchange, according to said message requiring said call reservation registration;

    transferring said second exchange to a state of said call reservation registration in response to said message requiring said call reservation registration and simultaneously outputting a call reservation registration response message to said first exchange;

    storing said call reservation information in said first exchange according to said call reservation registration response message and transferring said first exchange to a state of a call reservation;

    said first exchange checking said state of said incoming subscriber in said second exchange upon said second exchange being in said state of said call reservation registration and then inputting said message requiring said call reservation service to said second exchange upon said incoming subscriber being in an idle state;

    checking said state of said outgoing subscriber in said first exchange according to said message requiring said call reservation service and then forming a calling path of said outgoing subscriber and said incoming subscriber in said first exchange and said second exchange; and

    processing said call, upon said outgoing subscriber being in said idle state.

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