We are running Asterisk on a Linux system with a public IP. No issues with SIP audio. However, if firewall (i.e. ufw) is enabled, video call is not possible. It is blocking it at the SIP level, even before any RTP: CLI (with 'sip set debug on') shows nothing when a call is made. However, once ufw is disabled, video call works fine.
Port 5060 is open for udp and tcp. Also 10000-20000 udp. We even tried with 8000:30000/udp open. Any thoughts?