Wiring associated with the telephones under test are inspected for attachments, and damage. Damaged wiring is often the only evidence of a prior wiretap. Inspection of Junction Blocks. Junction blocks are where telephone wires connect to each other in the building. These connected wires form a path between the telephone instrument and the on-premises, telephone switching equipment.
Junction blocks are an easy, and relatively safe, place to attach a wiretap device.
This type of common attack is called a direct, or bridge, tap. Telephone Room Inspection. This is another area of vulnerability which requires an inspection from both a wiretapping and physical security point of view. Historically, they have received minimal security attention. Expect this to change as more people realize that this is the communications nerve center of their business.