The only biometric technology which does not measure the visual features of the human body. In voice recognition the sound vibrations of a person is measured and compared to an existing sample. The person to be identified is usually required to pronounce a designated password or phrase which facilitates the verification process. Voice recognition can be used on the phone, but has the weakness of technology is its susceptibility to interference by background noise.
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In 1948 the former alliance of USA, UK, Canada, Australia an New Zealand established in World War II was formalized into the UKUSA Signals and Intelligence agreement to aim primarily together against the former USSR, although readers of the agreement say, that it is definitely only signed by the United States and Britain. A number of other countries' SIGINT agencies also participate in the UKUSA community, including those of Germany, Japan, Norway, South Korea, and Turkey. These countries are sometimes described as "Third Party" members of the agreement. In addition, some countries, such as China, host UKUSA SIGINT stations or share SIGINT on a more limited basis.