The Yealink WH63 UC has a built-in busy light on the headset that indicates when you are on a call to reduce interruptions, while the optional busy light bar can be connected to the base station via the 2.5mm port.
Manufacturer Link:
https://www.alloy.com.au/products/WH63-UC/
Brand:
Yealink
Height:
0 cm
Length:
0cm
Warranty:
24 Months
Width:
0 cm