hmmm....well. If somebody is listening in there will usually be some noise. however if it is a legal wiretap, then it will be digitally recorded directly through the telco. You will not be able to hear it however it will be recorded and then listened to at a later time. However remeber this? have you ever dealt with the phone company and dealt with their superb customer service? Well imagine that same customer service hooking up the recorder. Hardly something to worry about unless you are a mob boss.
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