On phones with a text display area next to the button, the label Line and the line number are displayed.
When the user is not connected to a call, the button indicated as selected is the button that will be used if the user goes off hook without pressing an appearance button. When a user is connected to a call, that call is the selected button.
The following table shows how the different states of call appearance buttons (alerting, held, etc) are indicated. This is a general table, not all phone button types are covered. The ring that accompanies the visual indication can be delayed or switched off. See Ring Delay.
Icon Button |
Dual LED Button |
Appearance Button State |

|
All off. |
Idle The associated line is not in use. |

|
Red on. Green off. |
Idle + Selected The associated line is not in use but the button is the user currently selected button. |
Flashing icon.
|
Red off Green steady flash. |
Alerting The line is ringing at its incoming call route destination. This is accompanied by ringing. If the user is already on a call, only a single ring is given. |
Flashing icon.
|
Red on Green steady flash. |
Alerting + Selected As above but Ringing Line Preference has made this the user's current selected button. |

|
Red off Green on. |
In Use Elsewhere The line is in use. |

|
Red on Green on. |
In Use Here The user has answered the line, made a call on it or bridged into the call on the line. |

|
Red off Green fast flash. |
On Hold Here The call on the line has been put on hold by this user. |

|
Red off Green intermittent flash. |
On Hold Elsewhere The call on the line has been put on hold by another appearance button user. |
Icon flashes off.
|
Red off Green broken flash. |
Inaccessible The button pressed is not accessible. The call is still dialing, ringing, routing or cannot be bridged into. |