- Data Connection (DC) Directory
A user directory included with the Cisco CallManager software.
- D-channel
An ISDN channel that carries signaling information, using the Q.931 protocol.
- device unit
Represents the amount of work a CCM can perform.
- dial peer
A configuration option that tells a router how to reach specific phone numbers.
- dial plan
A set of instructions for reaching various phone numbers.
- difference signal
A sample representing the difference between a digital sample and the previous sample, which consumes less bandwidth than sending an entire sample.
- dual tone multifrequency (DTMF)
Two simultaneous frequencies that are interpreted as a dialed digit.
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