Yealink SIP-T2 SERIES Administrator's Manual page 558

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Line Key/Expansion Module Key LED (configured as a BLF key or a BLF List key and BLF
LED Mode is set to 4. This mode is specifically designed for the Genband server.)
LED Status
Solid green
Slow flashing green (1s)
Off
Procedure
BLF can be configured using the configuration files or locally.
Configuration File
536
The monitored user is talking.
The monitored user does not exist.
The monitored user is idle.
Specify whether to use visual alert and
audio alert for BLF pickup.
Parameters:
features.pickup.blf_visual_enable
features.pickup.blf_audio_enable
Assign a BLF key.
Parameters:
linekey.X.type/
expansion_module.X.key.Y.type
linekey.X.line/
y0000000000xx.cfg
expansion_module.X.key.Y.line
linekey.X.value/
expansion_module.X.key.Y.value
linekey.X.pickup_value/
expansion_module.X.key.Y.pickup_value
linekey.X.label/
expansion_module.X.key.Y.label
Configure BLF LED mode.
Parameter:
features.blf_led_mode
Configure the period of the BLF
subscription.
<MAC>.cfg
Parameter:
account.X.blf.subscribe_period
Description