Point, Click ... Eavesdrop: How the FBI Wiretap Net Operates
The FBI has quietly built a sophisticated, point-and-click surveillance system that performs instant wiretaps on almost any communications device. ...
The surveillance system, called DCSNet, for Digital Collection System Network, connects FBI wiretapping rooms to switches controlled by traditional land-line operators, internet-telephony providers and cellular companies. It is far more intricately woven into the nation's telecom infrastructure than observers suspected. ... FBI wiretapping rooms in field offices and undercover locations around the country are connected through a private, encrypted backbone that is separated from the internet. Sprint runs it on the government's behalf. ... FBI endpoints on DCSNet have swelled over the years, from 20 "central monitoring plants" at the program's inception, to 57 in 2005, according to undated pages in the released documents. By 2002, those endpoints connected to more than 350 switches.
Today, most carriers maintain their own central hub, called a "mediation switch," that's networked to all the individual switches owned by that carrier, according to the FBI. ... Privacy groups and security experts have protested CALEA design mandates from the start, but that didn't stop federal regulators from recently expanding the law's reach to force broadband internet service providers and some voice-over-internet companies, such as Vonage, to similarly retrofit their networks for government surveillance.