Cygnion CG 2400 - Manual (Page 78)

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Line indicators
The line indicators on the right side of the window
border show phone line status:
Green Indicates a line is available.
Red Indicates a line is in use.
Amber Indicates that outbound calling has been turned off
for this line.
Amber broken Indicates that the system cannot detect a dial tone
on the line.
Off (no light) Indicates the line is not connected.