Abstract: A system and method to protect a target telephone number from unauthorized access includes a first one-way encoding unit to encode the target telephone number using nonreversible encoding. A storage unit stores the encoded target telephone number. A second one-way encoding unit encodes a calling telephone number and a receiving telephone number using the non-reversible encoding. A comparing unit determines whether the stored encoded target telephone number matches the encoded calling telephone number and/or the receiving telephone number and routing a call between the calling telephone number and the receiving telephone number matching the target telephone number to a monitoring unit. The monitoring unit monitors and/or records the call and connects the calling telephone number to the receiving telephone number.

Abstract: A system and method to protect a target telephone number from unauthorized access includes a first one-way encoding unit to encode the target telephone number using nonreversible encoding. A storage unit stores the encoded target telephone number. A second one-way encoding unit encodes a calling telephone number and a receiving telephone number using the non-reversible encoding. A comparing unit determines whether the stored encoded target telephone number matches the encoded calling telephone number and/or the receiving telephone number and routing a call between the calling telephone number and the receiving telephone number matching the target telephone number to a monitoring unit. The monitoring unit monitors and/or records the call and connects the calling telephone number to the receiving telephone number.

Abstract: An intrusion detection system which reliably detects intrusions while minimizing false alarms by time-analyzing significant signals indicative of intrusions. The time length of each significant signal is measured, the time lengths of successive significant signals are accumulated, and an intrusion signal is generated if the accumulated time length reaches a first preselected time length. The time length between successive significant signals is also measured, and the accumulated time length is reset to zero if the time length between successive significant signals reaches a second preselected time length.