Using Busy Lamp Field to Determine a Line State
Depending on the configuration, you can use the Busy Lamp Field (BLF) feature
to determine the state of a phone line associated with a speed-dial button, call log,
or directory listing on your Cisco IP Communicator. You can place a call to this
line regardless of the BLF status. This feature does not prevent dialing.
If you want to...
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Then...
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See the state of a
speed-dial line
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Look for one of these indicators next to the line number:

+ Line is in-use.

+ Line is idle.

BLF indicator unavailable or not configured for this line.

+ Line is in Do Not Disturb state.
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See the state of a line
listed in a call log or
directory
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Look for one of these indicators next to the line number:

Line is in-use.

Line is idle.

BLF indicator unavailable for this line.

Line is in Do Not Disturb state.
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