[1.x] Failed to execute 'setRemoteDescription' on 'RTCPeerConnection': Failed to set remote answer sdp: The order of m-lines in answer doesn't match order in offer. Rejecting answer. about janus-gateway

[lminiero]

You're using the plugins wrong. You're sending a recvonly offer to the VideoRoom (I guess for a subscriber?), that the VideoRoom will ignore, since the VideoRoom plugin always offers for subscribers. If you want to use Janus for WHEP, you need to use the Streaming plugin.
https://www.meetecho.com/blog/whep-qui/

[lminiero]

Please refer to the Streaming plugin documentation for that.

[kboek]

Thank you for your response and blog article. So to connect WHIP to WHEP, do I need to create a mountpoint in the Streaming plugin that points to the stream in the Videoroom? And what would be the JSON for the "create" API call to the Streaming plugin?