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| Word |
Explanation |
| Dial-peer (Addressable Call Endpoint) |
Dial-peer is the software that combines a dialed number with the destination IP address or voice port. At least two of the several dial peers available on a router are responsible for a call. One of these dial peers is involved in starting a call and the other in its termination.
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| Dial-Peer Hunting |
A feature of VoIP systems where the originating device attempts to find an alternative call endpoint when a connection cannot be established to the intended endpoint. In order for dial-peer hunting to work the originating device must have a list of dial peers (all can route a call to the same endpoint, but use different destination routers) so the originating device can proceed to the next in the dial peer sequence.
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| DID (Direct Inward Dial) |
A customized phone line allowing internal users to directly call within the organization without seeking help from front-desk personnel. Though people outside the company can call a DID line through a central telephone number, enterprise users cannot call from outside since DID does not offer a dial tone.
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| DiffServ (Differentiated Services) |
DiffServ protocol aims at preserving voice quality by assigning a higher priority to voice, even during heavy traffic
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| DMARC |
DMARC is a demarcation point that sets apart two telecommunication systems or phone systems. This is generally the point between a customerâ??s phone line and the providerâ??s line.
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| DNIS (Dialed Number Identification Servi |
A common feature of toll-free services, call receivers use the DNIS to identify the telephone number a caller dialed. Organizations with multiple 800 or 900 telephone numbers use this service to detect the toll-free number a caller dialed and handle it accordingly. For instance, a caller dialing a sales and marketing toll-free number is directed to the sales and marketing department, whereas someone dialing the customer service number is connected to a customer care personnel.
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| DTMF (Dual-Tone Multi Frequency) |
Otherwise known as touch tone, DTMF refers to the signals produced when touch-keys on a telephone are pressed. Pressing a button on a touch-tone phone produces two tones, one for the row and one for the column. Both these tones are used to determine the number pressed. The same principal is used for data entry using a push-button telephone as in the case of phone banking, ticket booking and voice mail.
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| Dynamic Jitter Buffer |
A sound distortion reducing mechanism, dynamic jitter buffer gathers and handles voice packets shifting them at regular intervals to the voice processor.
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