Custom button on Trio for room control

Dear All,

Is there any way to add custom buttons to Trio display?

Since the device is capable of restAPI communication, I thought I'd put a button on the interface and assign a custom function (like restAPI ) to it, so I could implement simple room control.

I have not found any reference to this in the cParameters or the Admin guide yet.

I would use the Trio as a peripheral only, without SfB or SIP registration.

Thanks,

Laszlo