*

Asterisk. The symbol used to designate one of the special function keys on a touch-tone telephone keypad. (The other is the #, or octothorpe.) The * is found in the lower left-hand corner of the standard dual tone multifrequency (DTMF) keypad grid. See also DTMF.

• CSMA/CD (Carrier Sense Multiple Access with Collision Detection)
• CSTA (Computer Supported Telephony Applications)
• CSU (Channel Service Unit)
• CSU/DSU (Channel Service Unit/Data Service Unit)
• CT0 (Cordless Telephony generation 1)
• CT1 (Cordless Telephony generation 1)
• CT1+ (Cordless Telephony generation 1 plus)
• CT2 (Cordless Telephony generation 2)
• CT2 (Cordless Telephony generation 2)
• CT2 (Cordless Telephony generation 2)
• CT2+ (Cordless Telephony generation 2 plus)
• CT3 (Cordless Telephony generation 3)
• CT (Computer Telephony)
• CTD (Cell Transfer Delay)
• CTIA
• CTS (Clear To Send)
• CTX (CenTreX)
• CUG (Closed User Group)
• current (I)
• custom calling services
• custom control routing
• customer access line charge (CALC)
• customer contact center
• customer-originated trace
• customer-owned coin-operated telephone (COCOT)