0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
In telephony, any of a number of special functions that may be specified initially, or added to, the user's basic service. (188) Note: Modern telephone switches are capable of providing a wide variety of service features, such as call forwarding and call waiting.