主题：美国政府涉水网络监控有多深？ -- 唵啊吽

用得着5亿吗？本身电话系统就是集中式的，只需要局端接出个端口，通过这个局进行转接的电话就全都有了，方便得很，有关的代码，可能几千行就够了。

The digital telephony initiative was a successful effort by

the U. S. Government to maintain some capability to wiretap in

cases where advances in telecommunications technology could (or had

already) outrun law enforcement's ability to intercept

communications in order to enforce laws and protect national

security. Recent legislation [HR4922] passed by the U. S. Congress

requires telecommunications carriers to ensure that they possess

the capability and capacity to enable the government to isolate and

intercept, pursuant to authorization by a court, call identifying

information and the contents of a communication. The requirements

apply only to carriers who engage in "the transmission of switching

of wire or electronic communications as a common carrier for hire."

They do not apply to information service providers (the Internet,

America Online, Prodigy, etc.), to private networks, or to PBX's.

The requirements for obtaining a warrant prior to the interception

have not been changed. Law enforcement cannot require a carrier to

install a port which can be remotely activated by a law enforcement

officer. All taps must be conducted with the intervention of the

carrier (as is the case under current law).

The new law authorizes US$500 million to be paid by the

government for this retrofitting of the telephone system.