Telephone technology—voice, fax, or modem transmissions based on either the conversion of sound into electrical signals or wireless communication via radio waves.
The art or process of reproducing sounds at a distance, as with the telephone.

See TAPI.

A mechanism designed to translate sound into electrical signals, transmit them, and then convert them back to sound.

A modem driver that enables access to vendor-specific equipment through a standard device driver interface. Acronym: TSP. See also Telephony Service Provider Interface.

The external interface of a service provider to be implemented by vendors of telephony equipment. A telephony service provider accesses vendor-specific equipment through a standard device driver interface. Installing a service provider allows Windows CE–based applications that use elements of telephony to access the corresponding telephony equipment. Acronym: TSPI. See also Telephony Service Provider.

99.9994% uptime or the higher reliability standard circuit switches require (translating into 3 minutes of downtime a year), as opposed to the reliability standard of 99.999% (called).