...
80 HTTP - Default port for web browser traffic
443 HTTPS - Default secure port for web browser traffic
5060 TCP/UDP Traffic - SIP signalling traffic for IP Phones
8089 TCP - Used for establishing Websocket connections.
8090 TCP - Used for establishing Websocket connections.
9002 TCP - Used for establishing WebRTC connections.
10000-20000 UDP - Port range used for media transmission through WebRTC.
Traffic allowed to and from
*.sharpencx.com
*.sharpen.cx
*.cx.shpn.co
*.sipvbx.com
*.fathomvoice.com
*.s3.amazonaws.com
*.yealink.com
*.ckeditor.com
If whitelisting traffic , take note of the following tables
...