Devialet Phantom

Hi,

Would it be possible to control a Devialet Phantom via OpenHab ? I tried to use the UPNP binding. It discovers the Devialet Phantom. I created a thing and two items (mute, volume). Unfortunately, when I mute the speaker through the corresponding item, it does not mute the speaker. Idem for the Volume item. Nothing happened. Any idea how to make it to work ?

Thanks in advance,