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DASS II

UK ISDN signalling protocol.

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DC5

A signalling system used to communicate between two adjacent pieces of telecommunications equipment, for example between a telephone system and a router or multiplexer or between two co-located telephone systems. For communication over longer distances DC5 can be converted to AC15.

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DCTE

Data Circuit Terminating Equipment

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DCP

Digital Control Protocol

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DDI

Direct Dialling Inwards
A key ISDN feature is the ability to assign individual phone numbers (DDI Numbers) to extensions and departments, enabling callers to dial them directly without having to go through the operator.

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DECT

Digital Enhanced Cordless Telephony
 - DECT cordless handsets provide wireless communications within an office or company premises. The handsets can be fully integrated with the company phone system, allowing users to make, take and transfer calls securely as they move around the premises.