Those users who are running Microsoft Internet Explorer version 9 will these days get an update to version 10. One of the exciting changes with that version is that it supports WebSocket.
When the user logs into the user portal of the PBX, snom ONE now shows the availability of the extensions. This is a web-based attendant console. This can be used without installing any additional software. All that the user needs is a recent web browser, now including IE10. That means also, that the attendant console is available from practically any device that supports HTML. Not only PC and tablets support this; also more and more smart phones support WebSocket. You can see on http://caniuse.com/websockets what browsers are supporting it. The only missing spot is the native Android browser; you will have to install Chrome or Firefox on your Android to use this.
WebSocket will not go away so soon. This is something that we can build upon. The look of the attendant console might look very basic right now; but over time it will be looking pretty and more and more functionality will be available.