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BC
See bearer capability.
BCI
backward call indicator
BCSI
backward call special indicator
bearer capability
A characteristic associated with a directory number that indicates the type of
call (voice or data) and the rate of transmission requested by the user. The
bearer capability information element is required in the setup message for
functional signaling to indicate the type of call.
BER
bit error rate
BPV
bipolar violation
BSY
busy
call authorization
The verification that an off-hook line is connected to a valid user who is
authorized to make the call.
call condense block
A data structure associated with a call from initiation through completion
that holds all information about a call. The CCB contains enough
information to describe a basic call and can be extended for calls that require
more data.
call detail record
Billing information stored in billing files.
call processing busy
The state in which call processing is taking place and the equipment
involved cannot be seized for maintenance.
calling line identification
In data transmission, a supplementary service provided by the network that
allows a terminating party to be notified of the network address of the
originator. Screening of calling line identification is performed during call
setup only.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
List of terms 20-3
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