Jargon Buster

DDI – Direct Dialling Inward

This is the ability to assign individual phone numbers (DDI numbers) to extensions, faxes, computers and departments, enabling callers to dial them directly and automatically through the switchboard without having to go through a receptionist.

DECT – Digital Enhanced Cordless Telephony

DECT cordless handsets provide wireless communications within an office, building or site, and they can be fully integrated into the company telephone system.

DSL – Digital Subscriber Line

This is technology that brings high-bandwidth information to homes and small business over telephone lines. It can carry both data and voice signals. (See ADSL and SDSL)