D
DCO (Data Communication Option). An option for ROLMphone 600 series telephones that provides an access to the data and voice telephony features of the telephone.
dedicated trunk. A trunk that rings directly through to a specific internal telephone, hunt group, or distribution group.
digital phone. A telephone that uses digital signals to communicate with a business telephone system.
digital signal. The representation of data by discrete values as binary digits (in contrast to analog, which is continuous).
DND (Do Not Disturb). This feature allows a telephone user to block incoming calls to his or her telephone by preventing the telephone from ringing.
E
extension. A unique number assigned to a line appearing on one or more telephones that is connected to a CBX. Depending upon how the CBX is configured, an extension number can be from one to six digits long.
F
faceplate. A paper template that fits around the keys of a telephone in order to label the keys with the features or lines assigned to them.
faceplate lens. A clear plastic panel that fits over the telephone faceplate to protect it.
feature access code. The key pad sequence dialed by a user to access a telephone or system feature.
H
handset. A
headset. A device with a microphone and a speaker that fits over a user’s head and eliminates the need to use a handset.
hold. The status of a line when the connected parties are temporarily disconnected from each other without releasing the line.
