Computer telephony integration is a technology that allows interactions on a telephone and a computer to be integrated or co-ordinated. As contact channels have expanded from voice to include email, web, and fax, the definition of CTI has expanded to include the integration of all customer contact channels (voice, email, web, fax) with computer systems. Several functions can be implemented using CTI that includes - call information display, number dialed, screen population on answer, with or without using calling line data; automatic dialing and computer controlled dialing; and phone control.