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Basic Rate Interface (BRI) Feature
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Description
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BRI, like PRI, is a standard protocol for accessing Integrated Services Digital
Network (ISDN) services. By using BRI, the MERLIN MAGIX Integrated System
can connect its users to the speed and accuracy of ISDN services.
BRI lines offer the capability of voice, high-speed data, local area network
(LAN) interconnection, and video transmission. BRI lines (along with PRI and
T1 Switched 56) also allow you to take advantage of the 2B Data feature for
videoconferencing systems with ISDN-BRI interfaces. The 2B Data feature allows
one application (such as a desktop video system or a high-speed digital communications
device) to use two B-channels for data transfer rates up to 128 kbps. For more
information, see Digital Data Calls.
The following benefits are provided by NI-1 BRI service:
- Speed. Data calls to outside destinations can be established on
the same B-channels used for voice calls if the service allows; modems and
dedicated, conditioned lines/trunks are not needed. By supporting high-speed
digital data transmission, BRI provides the capability for videoconferencing
and Group IV (G4) fax by using existing wiring. Each B-channel supports up
to 64 kbps throughput.
- Improved Toll Restriction. The ways that Toll Restriction can be
bypassed are limited on BRI lines/trunks. Specifically, BRI service eliminates
three types of toll fraud:
- Because dialing is in the form of out-of-band messages that must be
generated by the system, a person cannot use a Touch-Tone generating device,
such as a pocket dialer, to send dialed digits directly through the system
to the line/trunk.
- Without BRI service, Toll Restriction can be deceived by dialing digits
on a loop-start line before the far-end switch applies dial tone. These
initial digits may indicate a local call to the system's toll-restriction
checking while the subsequent digits, those actually recognized by the
far-end switch, may produce a toll call. This is not possible with BRI
service, because the system's toll-restriction check screens every dialed
digit.
- A BRI line's far-end disconnect signal provides a reliable indication
when a call ends, and a new call cannot be initiated until the line has
been released from the prior call on both ends. This prevents a person,
waiting off-hook for the restoration of dial tone after a previous call,
from placing a second call before Toll Restriction is reapplied.
- Reliable Indication of Far-End Disconnect. This prevents an incoming
call from being blocked because a line/trunk has not been released when a
call is ended.
