Yealink SIP-T48G Administrator's Manual page 329

Line Key/Expansion Module Key LED (configured as a BLF key a BLF List key and BLF LED
Mode is set to 2)
LED Status
Fast flashing red (200ms)
Solid red
Slow flashing red (1s)
Off
Line Key/Expansion Module Key LED (configured as a BLF key a BLF List key and BLF LED
Mode is set to 3)
LED Status
Fast flashing green
(200ms)
Solid red
Slow flashing red (1s)
Off
Description
The monitored user receives an incoming call.
The monitored user is dialing.
The monitored user is talking.
The monitored user's conversation is placed on hold
(This LED status requires server support).
The call is parked against the monitored user's phone
number.
The monitored user is idle.
The monitored user does not exist.
Description
The monitored user receives an incoming call.
The monitored user is dialing.
The monitored user is talking.
The monitored user's conversation is placed on hold
(This LED status requires server support).
The call is parked against the monitored user's phone
number.
The monitored user is idle.
The monitored user does not exist.
Configuring Advanced Features
315