Unify OpenScape Desk Phone IP 55G - Line Keys (on Multi-Line Phones Only)

Getting to know the OpenScape Desk Phone IP 55G 25
Line keys (on multi-line phones only)
The programmable keys on multi-line phones function as line or trunk keys. Each key that is as-
signed the "trunk" function corresponds to a line. This means up to eight lines can be configured
on the OpenScape Desk Phone IP 55G.
A distinction is made here between primary, secondary and phantom lines. Each of these line
types can be used on a private or shared basis
 Page 25.
Primary line
All multi-line telephones have a primary line. This line can be reached in the usual manner via your
public phone number. Incoming calls are signalled on this line.
Secondary line
A secondary line on your phone is used as a primary line by another subscriber of the line trunk
group. Your primary line, which is configured on another telephone of a line trunk group, simulta
-
neously functions as the secondary line on that telephone.
Phantom line
Phantom lines are not used as primary lines by any telephones in a line trunk group. Phantom lines
are established, for
example, when the number of lines provided by a communications system ex-
ceeds the number of available telephones.
Line utilisation
• Private line: A line that is used by a single telephone. This line cannot be used as a secondary
line by another telephone.
• Shared line: A line that is configured on multiple telephones. The line status (if configured) is
displayed on the "Overview" tab for all telephones that share this line. If, for example, a shared
line is being used by a telephone, a status message indicating that this line is busy is displayed
on all other telephones that share this line.
• Direct call line: A line with a direct connection to another telephone.
The line status is indicated by the LED in addition to the display on the "Overview" tab  Page 35.
LED displays
To avoid conflict between individual multi-line phones, the functions "Do not disturb" and
"Call forwarding" can only be used for the primary line.
LED Meaning
Off: The phone is in idle mode.
Flashing:
• Incoming call on the line  Page 124
• Hold reminder is activated
 Page 104
Flickering:
• Outgoing call on the line
• The incoming call was prioritised and selected in accordance with the "Auto-
matic line selection for incoming calls" option
Fast blinking: The line is on "Hold".
Blinking: Call forwarding is activated
Illuminated: The line is busy