Nortel BCM 3.7 Manual page 892

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transferred call was assigned a higher intrusion level. Also, the user at the other end has
the option of refusing the call by entering the Do Not Disturb feature code.
BRI
The Basic Rate Interface (BRI) ISDN interface uses two B-channels and a D-channel
(2B+D). ETSI BRI is the European Telecommunications Standards Institute specification
for BRI ISDN service. BRI is supplied to the Business Communications Manager through
a BRI media bay module. For details about BRI service, refer to
page 857.
BST doorphone
This piece of hardware acts as an alerter and intercom at an outside entrance to your office.
The device uses the paging feature to provide an alerter chime or voice connections to
internal telephones. The doorphone is based on the legacy 7324 firmware.
bus
A collection of communication lines that carry electronic signals between components in
the system. Besides internal communications, the Business Communications Manager
MSC uses buses to support media bay modules and IP telephony components.
byte
The amount of space required to store a single character. One byte is equal to eight bits.
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callback
Modem security: If this feature is enabled, a user dialing into the Unified Manager can be
confirmed by having the Business Communications Manager terminate the dial-in and
then dial back to the number provided for the user. This ensures that the user is dialing
from a known source.
Call return: If you park, camp, or transfer a call to another telephone and no one answers
the call, the call rings again at your telephone. Set the timing for this in Timers, Transfer
callback timeout. (Services, Telephony Services, General Settings). See also call queuing.
Call-by-Call services
This is a PRI (North American) line feature that provides a system of remapping specific
incoming lines for specific destinations. These services include INWATs (800), foreign
exchange (FX), international 800, switched digital (SDS), and nine hundred (900). The
type of service is based on the type of central office switch from which the line originates.
call duration timer
A feature that allows you to check how long you were on your last call or how long you
have been on your present call. (FEATURE 77)
• no active call: set displays the duration of the last active call
N0008589 3.3
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