AASTRA 6731i Installation Guide EN - Manual (Page 21)

Other Phone Features
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Line/Call Appearance Keys
The 6731i has 2 hard/line call appearance keys each with a corresponding status light. Additional line call appearances
may also be set up on your phone as programmable keys which also have status lights. The 6731i supports up to 6 line
keys in total (2 hard, 4 programmable).
These line call appearance buttons and lights represent physical lines or calls for your extension. By pressing a line call
appearance button, you connect to the line or a call it represents. The line call appearance light indicates the status of
that line or call.
When the phone is taken off-hook, the phone will automatically select a line for you.
For more information about the Line Call Appearance keys, see the Aastra Model 6731i IP Phone User Guide.
Line Call Appearance LED Status Description
OFF Indicates idle line or no call activity.
Rapid Flash Indicates ringing on the line.
Slow Flash Indicates a call is on hold.