| Direction | Source | Destination | Port | Protocol | Purpose | |-----------|--------|-------------|------|----------|---------| | Inbound | Any (or user IP) | 3CX Server | 443 | TCP | WebSocket (Tunnel) | | Inbound | Any | 3CX Server | 5001 | TCP | HTTPS/WebRTC fallback | | Inbound | Any | 3CX Server | 5090 | TCP | Tunnel (legacy) | | Inbound/Outbound | 3CX Server | Any | 9000-10999 | UDP | Media (if not using TURN) |
A WebRTC (Web Real-Time Communication) client (e.g., Chrome/Edge browser, 3CX WebClient) fails to register its SIP line with the 3CX Phone System. The extension appears as "Unregistered" or "Red" in the Management Console, preventing inbound/outbound calls. 3cx webrtc line is not registered
Check your router/firewall settings and . While WebRTC behaves differently than standard SIP, SIP ALGs can still interfere with the headers and modify packets in ways that break registration. | Direction | Source | Destination | Port