I've created the Service interface to the Jabra device, like the example in the SDK

JabraSDK.IDeviceService service =  factory.CreateDeviceService(ProductID); 
services.Add(service); 
service.FirstScanDone += service_FirstScanDone; 
service.DeviceAdded += service_DeviceAdded; 
service.DeviceRemoved += service_DeviceRemoved; 
service.TranslatedButtonInput += service_TranslatedButtonInput; 

but any othe the registered events fires nothing when I press the buttons in the headset.

Am I missing something?

I found that you must set the HID Working State to GN_HID for the button events to fire:

device.SetHidWorkingState(HidState.GN_HID)

device.SetHidWorkingState(HidState.GN_HID)

Is not working.
The button press is not detected.

I've used also your "jabra sdk demo", set the property GN_HID but the "ButtonInDataTranslated" event doesn't fire.

Hello
Is this still an issue for you?

Yes, It's a two years issue you still haven't answered.

It seems that there's no way to detect the answer/call button press.

Can you send me a fully functional project in C# that can detect the button press?
It's VERY important for me.
We have purchased the Jabra because of the SDK, that is not working for this problem.
Thank you.

> Yes, It's a two years issue you still haven't answered.

Ok.But you also have a ticket in the support system registered with a lot more information exchanged.
I will re-open that ticket and continue the support dialogue there.
(We can update this thread once we found a solution).