Hello!
Could you please check if the extension associated with the vitxi user has the webrtc profile assigned?. Also, make sure the following codecs are added in the pjsip settings: opus, allaw, ullaw, vp8
Also, please update to the latest version of VitXi: š VitXi WebRTC v4.6.0-2: Faster, Smarter Communication Experience
Let me know if it worked for you,
Best regards,