All the Crestron voice recognition requires an internet connection and will not work without it.? It is only built into the Android based panels and uses Google's voice recognition service.?
If they open up the network, you might be able to make it work from the touchpanel as long as you have one of the Android ones.? I am fairly certain that Apple does not allow Crestron to use Siri for voice recognition purposes so the iPad would seem hopeless without a third party product.?
