WHAT'S THIS FOR - This page is our section aimed at de-mystifying the telecom industry.

There are 11 entries in this glossary.

D

DDI

(Direct Dialling In) A key function of an ISDN phone system, is the ability to assign unique numbers to people and departments, enabling callers to dial them directly without going through an operator.

Why? This significantly improves your traffic management and sends them to the right individual, great customer services!