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dB
dB
dBA
dBrnC
DC
DCE
D-channel backup
DCO
DCP
DCS
DDC
DDD
delay-dial trunk
denying a request
designated voice
terminal
dial-repeating trunks
dial-repeating tie trunk
DID
400 Communication Manager Guide to ACD Call Centers
Decibel
Decibels in reference to amperes.
Decibels above reference noise with C filter.
Direct current
Data-communications equipment
Type of backup used with Non-Facility Associated Signaling (NFAS). A primary D-
channel provides signaling for an NFAS D-channel group (two or more PRI facilities).
A second D-channel, on a separate PRI facility of the NFAS D-channel group, is
designated as backup for the D-channel. Failure of the primary D-channel causes
automatic transfer of call-control signaling to the backup D-channel. The backup
becomes the primary D-channel. When the failed channel returns to service, it
becomes the backup D-channel.
Digital central office
Digital Communications Protocol
Distributed Communications System
Direct Department Calling
Direct Distance Dialing
A trunk that allows dialing directly into a communications system (digits are received
as they are dialed).
Sending a negative acknowledgement (NAK), done by sending an FIE with a return
error component (and a cause value). It should not be confused with the denial event
report that applies to calls.
The specific voice terminal to which calls, originally directed to a certain extension,
are redirected. Commonly used to mean the forwarded-to terminal when Call
Forwarding All Calls is active.
A PBX tie trunk that is capable of handling PBX station-signaling information without
attendant assistance.
A tie trunk that transmits called-party addressing information between two
communications systems.
Direct Inward Dialing
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