Telephone Surveillance · Landline Taps
Landline Tap Detection
Professional detection of wiretaps, series and parallel telephone taps, and inductive monitoring devices on landline systems.
Communications surveillance extends well beyond a bug in a room. Your phone lines — analog, digital, VoIP, and conference call systems — can be tapped, bridged, or intercepted at multiple points along their path. A tap placed at a terminal block in your building's basement, an unauthorized bridge on your PBX, or a conference call that has been joined by an uninvited party are all documented threats that Empire Investigation's telephone surveillance team detects and documents.
Landline tap detection involves impedance testing, loop current analysis, RF detection for active transmitting taps, and physical inspection of terminal blocks, junction boxes, and wiring runs. VoIP and conference line analysis involves network traffic inspection, system log review, and testing for unauthorized concurrent sessions or bridges. Our investigators have the technical and legal knowledge to preserve findings for criminal prosecution or civil litigation.
Types of Landline Tapping Devices
Landline taps fall into two primary categories: series devices that are wired directly into the telephone line, and parallel devices that connect to the line without breaking it. Inductive taps require no physical connection to the line and are the hardest to detect. All three types require different detection approaches. Our telecommunications security audit addresses all categories.
External vs. Internal Tap Points
Tapping a landline does not necessarily require access to the interior of a building. Telephone junction boxes, distribution points, and network interface devices outside a building can all be points of access for tap installation. A thorough inspection includes examination of external telephone infrastructure as well as interior wiring and handsets.
What We Look For
- Series taps installed within telephone wiring
- Parallel tap devices connected without line interruption
- Inductive tap devices requiring no direct line contact
- External tap installations at junction boxes or NIDs
- Telephone handset modifications for internal monitoring
Our Sweep Process
External Infrastructure Inspection
Examination of telephone junction boxes and NIDs.
Internal Wiring Inspection
Tracing of internal telephone wiring for unauthorized devices.
Electronic Line Testing
Voltage, impedance, and current analysis for anomalies.
Handset Inspection
Physical inspection of all telephone handsets.
Documentation
Technical report of all findings.
Frequently Asked Questions
Confidential Inquiry
Schedule a Confidential TSCM Sweep
If you suspect surveillance or want to verify your environment is secure, professional detection is the only way to know with certainty.
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