In terms of differentiation, I have not explored much solutions available out there so can not comment much on that. About the encryption part, WebRTC communications over browsers are encrypted using Datagram Transport Layer Security (DTLS). All WebRTC sessions are encrypted.
You can found more in depth details in this article: https://telnyx.com/resources/webrtc-encryption-and-security
And sorry for not replying I was not on the platform lately