You are likely to encounter three main types of digital telephone systems in the world of business today. A fixed digital telephone system is connected to the main telephone network via cables.

For the first 100 years of the telephone business, all telephone circuits were analog. They were designed around the characteristics and problems of analog current and were maximized for that use.

Last year, members of Congress ineffectually complained about the trivial wrist-slap "discipline" of CIA administrators responsible for permitting the Ames spy debacle. The IRS told Congress it ...

Every GP practice in England is now working towards adopting digital telephony, the health secretary has said. Speaking during a debate on access to primary care in the House of Commons yesterday, ...