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You configured the BLF keys but the BLF LED is not lightened when the monitor extension is registered or has incoming call or during in a call.
1. First of all, make sure the Monitored Account you used is registered successfully.
2. If your server is not Broadsoft platform, please don’t choose “Server Type” as “Broadsoft” please just choose “Default” otherwise it will make the BLF don’t work.
The path:
Go to Account->Advanced page.
3. Make sure the Line you choose for the BLF key is the one registered with same PBX as Monitored Account:
Path:
Go to DSSKey page 
4. And please note that we have an option for you to enable or disable BLF LED when the monitor extension is in idle, details are like below,
Path : go to Features->General Information
If this option “ LED Off in Idle” is configured with “Disabled”, when the monitor extension is in idle, the BLF LED will be lighten (Green);If this option is configured “ Enabled “ when the monitor extension is in idle, the BLF LED will not be lighten(off).
Only for distributor or professional engineer
If check but find all above settings are correct, Please offer us issue data for analyzing as below:
a. level 6 syslog
b. pacp trace
c. config.bin
You can get the guide from our forum to see how to export the issue data:
http://forum.yealink.com/forum/showthread.php?tid=1319
For more information of “BLF” feature, please refer to Yealink Admin Guide:
Yealink_SIP-T4X_IP_Phone_Family_Administrator_Guide_V72_2.pdf
