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Method system and device for line monitoring

  • US 6,608,885 B1
  • Filed: 08/06/2001
  • Issued: 08/19/2003
  • Est. Priority Date: 11/16/1998
  • Status: Expired due to Fees
First Claim
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1. Method for line monitoring in a system comprisingan integrated services digital network (ISDN);

  • a master terminal (MASTER), which is connected to a place of reception (PR) of a response and to the integrated services digital network (ISDN); and

    a slave terminal (SLAVE), which is connected to an object being monitored (OM) and to the integrated services digital network (ISDN), wherein the method comprises the steps of;

    starting a first call setup of a control call from the master terminal (MASTER) to the slave terminal (SLAVE);

    identifying by means of the slave terminal (SLAVE) the control call originated by the master terminal (MASTER) on the basis of a predetermined ringing procedure before answering the control call;

    terminating the first call setup procedure;

    starting a second call setup of an acknowledgement call from the slave terminal (SLAVE) to the master terminal (MASTER) upon lapse of a suitable length of time after the control call;

    identifying by means of the master terminal (MASTER) the acknowledgment call originated by the salve terminal (SLAVE) on the basis of a predetermined ringing procedure before answering the acknowledgement call; and

    terminating the second call setup procedure.

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