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ISDN Software Reference for Linux and Windows
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be notified of an incoming call (as per the basic call establishment
process) with an indication that no information channel is available.
CEPT
Conference des Administrations Europeenes des Postes et
Telecommunications. A collection of groups that set European
telecommunication standards.
CES
Connection Endpoint Suffix
CRN
Call Reference Number
CRV
Call Reference Value
D channel
Signaling channel used for transmitting signaling information
across ISDN networks. This information is used to control transmission
of data on associated B channels.
data structure
Programming term for a data element consisting of fields,
where each field may have a different definition and length. A group of
data structure elements usually share a common purpose or
functionality.
DIALOG/HD
Voice and/or telephone network interface resource boards
that communicate via the SCbus. These boards include D/160SC-LS,
D/240SC, D/240SC-T1, and D/300SC-E1. (Also referred to as
SpanCards.)
DNIS
Dialed Number Identification Service. A feature of 800 lines that
allows a system with multiple 800 lines in its queue to access the 800
number the caller dialed. Also provides caller party number
information.
DPNSS
Digital Private Network Signaling System. An E-1 primary rate
protocol used in Europe to pass calls transparently between PBXs.
driver
A software module that provides a defined interface between the
program and the hardware.
drop-and-insert configuration
A configuration in which two network
interface resources are connected via an internal bus, such as the SCbus,
to connect calls from one network interface to another. A call from one
network interface can be "dropped" to a resource, such as a voice
resource, for processing. In return, the resource can "insert" signaling
and audio and retransmit this new bit stream via the internal bus to