D. F1 BUTTON
Telephone Channel / Telco (Default Setting).
In the presence of an incoming call, the F1 button starts blinking,
By pressing F1 two times it will hook the call.
- F1 LED off – the line is not hooked.
- F1 LED blinks – RING – there is an incoming call.
- F1 LED on – the line is hooked.
By pressing F1 again also two times you drop the line.