The UCP Phone (formerly WebRTC Phone) is an in-browser phone. The Phone widget allows an Administrator to enable a "WebRTC phone" that can be attached to a user's extension which they can connect to through the PBX User Control Panel, this phone will then receive phone calls at the same time as the users extension using user and device mode behind the scenes. If you have User and Device Mode enabled any extension you enable the WebRTC Phone a duplicate extension of 99XXXX will be created (where XXXX is the original extension number), when the user then views the web interface of the WebRTC phone they will be connected to device 99XXXX which will receive calls from the original extension.
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At the time of writing (March 13th 2017) the APIs to utilize the in-browser phone are only supported in Edge, Firefox, Chrome and Opera. See below for a list of supported browsers (in green or light green/yellow):
Additionally the in-browser phone requires a secure connection with a valid certificate. There is currently no way around this. You can get a free certificate through Let's Encrypt with the Certification Manager module.