Are calls inside the FortKnoxster platform encrypted?

Yes.

Audio and video calls are end-to-end encrypted and we use the WebRTC technology for real time audio and video communication. WebRTC uses Secure Real-time Transport Protocol (SRTP) for encrypting media streams.

On top of the WebRTC protocol, we have custom built additional security layers in order to make WebRTC even more secure.

Before a peer-to-peer call is established between two or more users, some signalling is done to exchange certain information and set up the call.
This signalling is done over the existing Chat/XMPP channel and is also end-to-end encrypted using the same encryption scheme for message exchange with AES/RSA.