A Legal and Law Enforcement Guide to Telephony: Addressing Technical, Legal and Police Issues Relating to the Interface and Interaction with Communication Service Providers
The goal of this book is to provide legal and law enforcement practitioners with factual, informative, and easy-to-understand information about telephone company inner workings, their networks, and operation. The range of subjects includes local, long distance, and cellular services; private phone systems (PBX and KTS); E-911 systems; telephone fraud; pay phones; customer premises wiring; and new technologies including Voice over the Internet (VoIP). Telephone calls, like people, leave fingerprints known as call records for virtually every call that passes through the telephone network. These fingerprints are useful to law enforcement, aiding in reconstructing events and tracking the movement of individuals. Although competition in the local, long distance, and cellular industries has increased the need to generate a greater volume of call records, the typical subpoena does not result in an exhaustive discovery. Many telephone company personnel are unaware that some of these records exist, where they are, or how to find them. Unlike investigations where trained law enforcement specialists look for and gather evidence, law enforcement agencies are dependent on telephone company personnel to look for and gather call records.
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FRAUD AND NUISANCE CALLS
THE SWITCHED TELEPHONE NETWORK
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800 numbers 911 call center area code billing bypass call detail records call forwarding call originated call records call routing Call Type called number called party caller ID calling card cell cellular centrex charges CLEC communication company central office connection customer premises dial tone digital loop carrier digital subscriber line equipment example facilities handset ILEC incoming calls inside wire international calls Internet ISDN jack key telephone systems landline law enforcement lLEC long-dis long-distance call long-distance service provider Main distribution frame number portability operation pay phone pay phone provider PBX station PBX systems PBX trunks pen register phone adapter phone number PSAP PSTN remote wire center satellite shown in Figure signaling smart pay phones SMDR subscriber's Table telco tele Telephone company central Telephone company switching telephone network telephone number telephone service trunk group type of call voice mail VoIP wireless