Telephony

Computer telephony integration, also called computer–telephone integration is a common name for any technology that allows interactions on a telephone and a computer to be integrated or coordinated.

Screen popping - Call information display (caller's number (ANI), number dialed (DNIS), and Screen pop on answer, with or without using calling line data.
Dialing
Phone control - Includes call control (answer, hang up, hold, conference, etc.) and feature control (DND, call forwarding, etc.).
Transfers
Call center - Allows users to log in as a call center agent and control their agent state

Call routing - The automatic routing of calls to a new destination based on criteria normally involving a database lookup of the caller's number (ANI) or number dialed (DNIS).
Advanced call reporting functions
Voice recording integration - Using data from CTI to enrich the data stored against recorded calls.

International Mobile Equipment Identity is a number, usually unique to identify GSM, WCDMA, and iDEN mobile phones, as well as some satellite phones. It is usually found printed inside the battery compartment of the phone. It can also be displayed on the screen of the phone by entering *#06# into the keypad on most phones.