Cisco SX20 and WebEx room service - Firewall ports

[SamSamy]

I have a Cisco SX20 endpoint registered into Webex room service.  The VC endpoint is configured with local LAN IP address and NATted into a public IP.  

Does anyone know which firewall ports need to be opened?  Thanks,

[Mike_Brezicky]

Please review the document here for firewall ports:
https://help.webex.com/en-us/WBX264/How-Do-I-Allow-Webex-Meetings-Traffic-on-My-Network

Also, it is not best practice to expose the video system to the internet like that, even with a NAT. You are better off configuring an expressway to handle the public traffic. And if the device is webex registered, it does not need to have a public IP.