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46 OL-15791-01
Using BLF to Determine a Line State
Busy Lamp Field features (BLF) allow you to view the state of a phone line that is associated with a
speed-dial button, call log, or directory listing on your phone. If you use BLF Pickup, you can answer
a ringing call for the line that you are monitoring. Your system administrator determines which BLF
features are configured for your phone.
Tips
• Your phone might play an audible indicator to alert you when a call is ringing on the monitored
line (BLF Pickup only).
• BLF Pickup answers the oldest ringing call first (if the line that you are monitoring has more than
one ringing call).
Making and Receiving Secure Calls
Depending on how your system administrator has configured your phone system, your phone might
support making and receiving secure calls.
Your phone can support these types of calls:
• Authenticated call—The identities of all phones participating in the call have been verified.
• Encrypted call—The phone is receiving and transmitting encrypted audio (your conversation)
within the Cisco IP network. Encrypted calls are also authenticated.
If you want to... Then...
See the state of a line
listed in a call log or
directory
Look for BLF indicators next to the line number:
Line is in-use.
Line is idle.
See the state of a
speed-dial line
Look for BLF indicators next to the line number:
Line is in-use.
Line is idle.
BLF- monitored line is ringing (BLF Pickup)
Use BLF Pickup to
answer a call ringing on
a coworker’s phone
Press the BLF Pickup button while the line is ringing.
The call is redirected to the next available line on your phone. (If you want
to specify a line, first press a line button, then press the BLF button.)
If your phone supports auto-pickup, the call connects automatically.
Otherwise, the call rings on your phone for you to answer.
If you press the BLF Pickup button when the monitored line is not ringing,
your phone will speed dial the line number.