Problem for WebRTC on Intel Nuc

We have install Rainbow WebRTC on Intel Nuc and we got problem.

1. Rainbow client can't call to Deskphone

2. Deskphone can call to Rainbow client but don't have ring or notification on client app.

I have captured traffic with wireshark I can see traffic sent from PBX to WebRTC but WebRTC respond with 404 not found and then we decide to install WebRTC on Hyper-V on my NB and use it replace Intel Nuc then Rainbow work.

Please recommend me to fix this problem.

Thank you.