For that normal WebRTC is better., apparently Zoom uses websockets + wasm. WHIP/WHEP/WHAP was more a replacement for RTMP of streaming (such as Twitch). I mean technically you could open 2+ streams & have both sending a WHIP output & taking in a WHEP input. But that would defeat the purpose of WebRTC 1:1, and each participant would be $1/1000minutes.