Siemens 300 Series User Manual page 187

HRO (Headset/Recorder Option). A modular upgrade option to
ROLMphone 600 series telephones. It allows a headset to be attached to the
telephone.
hunt group. A group made up of telephones arranged to share the call load;
each group is assigned a dummy extension number called a pilot number.
J
jack. A receptacle used to connect a cord, a plug, an earphone, or a speaker.
K
KEO (Keyboard Expansion Option). A modular upgrade option to
ROLMphone 600 series telephones. It is designed to provide an additional
20 lines.
key pad. A group of keys on the telephone used for dialing telephone
numbers and accessing features. These keys are labeled 0 through 9,
*, and #.
L
line key. A key on your ROLMphone telephone that provides access to an
extension. Each line key allows a single telephone call, and a telephone
with multiple line keys allows a user to place multiple simultaneous calls.
A user can talk on only one line at a time, though he or she may have
another call waiting on hold on another line, for example.
M
mute. A feature key that turns the telephone microphone off and on. This
feature controls the microphones in both the handset and the speakerphone.
O
off-hook. The condition indicating the active state of a data or voice line.
When you pick up the handset to make or answer a call, the handset is
"off-hook."
outgoing call. Any call directed outside of your company's telephone
system.
Glossary G–3