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Land-line telephones are vulnerable to wiretaps, both on premises and at a central station. These telephone security devices will let you know whether or not a line is secure.
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TT-07 Telephone Wiretap Detector, Tests For On-Premises Series and Parallel Taps Comsec C3i-II is the only unit designed specifically to detect central station or down-line taps. TT-46 Advanced Telephone Wiretap Detector, Tests For On-Premises Series and Parallel Taps