| description | ROBOTS | ms.assetid | title | ms.topic | ms.date |
|---|---|---|---|---|---|
The following terms are useful in understanding the TAPI technology. |
NOINDEX, NOFOLLOW |
d910f954-6516-47d1-be3b-37fe557f4f43 |
D (Telephony API) |
article |
05/31/2018 |
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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D channel
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A data channel of the ISDN interface. It is one of the three standard channels on a Basic Rate ISDN line. On a BRI-ISDN line, a D channel can carry signaling information and low-speed packet data at a rate of 16,000 bps. On a PRI- ISDN line, the D channel runs at 64,000 bps. See Basic Rate Interface (BRI-ISDN), B channel, Primary Rate Interface (PRI-ISDN).
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device class
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A group of related physical devices or device drivers through which applications send and receive the information or data that makes up a call. For a list, see TAPI Device classes.
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DID
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See direct inward dialing (DID).
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direct inward dialing (DID)
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An ability provided by virtually all modern PBXs that allows an external caller to reach an internal extension by dialing a standard seven-digit telephone number without having to pass through an operator or attendant. See private branch exchange (PBX).