Inter-Tel AXXESS Manual page 589

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D-Channel Backup: Because the D-channel supports the other channels in the ISDN
network, loss of the D-channel would cause loss of access to the ISDN circuits. D-chan-
nels can be backed up to provide protection in the event of D-channel loss. D-channel
backup is especially important in Non-Facility Associated Signaling (NFAS), because
the D-channel supports all of the B-channels in the entire network. This is not sup-
ported in the current system software.
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Dedicated Service: Dedicated service reserves a group of B-channels for a specific
function, such as outgoing calls. The system uses trunk group programming to deter-
mine how the channels are used. Therefore, the system would require a separate trunk
group for each function. The installer can create "PBX-provided" dedicated service on
call-by-call circuits through DB Programming (such as incoming only or accessible
only to a group of users) or the service provider can determine the dedicated service.
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Dialed Number Identification Service (DNIS): DNIS identifies the number that the
caller dialed to reach your location. The system receives a base number and a specified
number of digits that identify the dialed number. *DNIS* is a form of DNIS that does
not have a specified number of digits. The system receives a star (*) before the DNIS
digits to signal the beginning of the dialed number. Then there is another star after the
digits to signal the end of the DNIS information.
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Flexible Billing: Flexible billing allows a 900 subscriber to modify a call's billing rate
while speaking with the caller. This is not supported in the current system software.
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H0 and H11: These switched digital service types combine contiguous B-channels into
a single bit stream. H0 combines six channels into a 384 kbps bit stream. H11 combines
24 channels into a 1536 kbps bit stream. Applications for these services include video
conferencing and LAN connections. This is not supported in the current system soft-
ware.
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Integrated Services Digital Network (ISDN): ISDN is a network of channels that can
provide simultaneous voice, data, and video communication.
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Multi-Rate ISDN: This type of switched digital service allows the user to dial up, on
demand, any number of combined B-channels. This is not supported in the current sys-
tem software.
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N X 64 kbps: This switched digital service type combines the B-channels into a single
bit stream. Applications for this service include video conferencing and LAN connec-
tions. This is not supported in the current system software.
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Network Ring Again: Network ring again is like the system queue feature that allows a
caller to queue on to a busy station and then be called when the station is available.
However, network ring again allows queuing between two PBXs that are on the same
ISDN network. This is not supported in the current system software.
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Non-Facility Associated Signaling (NFAS): When a site uses several Primary Rate
Interface circuits, the D-channel on one circuit can support the B-channels on other cir-
cuits, providing one additional B-channel per circuit (that is, 24 B-channels instead of
23B+D). This is called Non-Facility Associated Signaling or NFAS. This arrangement
also requires D-channel backup. This is not supported in the current system software.
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On-Demand B-Channel Selection: This feature allows on-demand allocation of B-
channels. With on-demand B-channel selection, all B-channel trunks can be assigned to
one trunk group and then programmed to be used as needed (ARS, outgoing access,
etc.). This feature takes full advantage of the Inter-Tel system features (trunk groups,
ARS, and call routing) and allows maximum on-demand use of the bandwidth. This can
be combined with Dedicated Service.
Terminology
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INTER-TEL AXXESS MANUAL VERSION 11.0 – May 2008
System Features
Page 5-63
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