D
Dial-peer (Addressable Call Endpoint)
A software structure that binds a dialed digit string to a voice port or IP address of the destination gateway. Several dial peers always exist on each router in the network, and at least two will be involved in making a call across the network, one on the originating end and one on the terminating end. In Voice over IP, there are two kinds of dial peers: POTS and VoIP. VoIP peers point to specific VoIP devices.
Dial-peer hunting
Process when the originating router tries to establish call on different dial peers if the originating router receives a user-busy invalid number or an unassigned-number disconnect cause code from a destination router.
DiffServ (Differentiated Services)
A quality of service (QOS) protocol that prioritizes IP voice and data traffic to help preserve voice quality, even when network traffic is heavy.
DNIS (Dialed Number Identification Service)
A telephone function which sends the dialed telephone number to the answering service.
DTMF (Dual-Tone Multi Frequency)
The type of audio signals generated when you press the buttons on a touch-tone telephone.
Dynamic Jitter Buffer
Collects voice packets, stores them, and shifts them to the voice processor in evenly spaced intervals to reduce any distortion in the sound.
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