How to use VoipNow behind a firewall ​
This article provides guidelines on the ports and firewall rules that must be configured to ensure proper operation of a VoipNow server deployed behind a firewall.
| Port(s) | Protocol | Description | Notes |
|---|---|---|---|
| 22 | TCP | SSH remote access | |
| 25 | TCP | SMTP for email2fax | |
| 53 | UDP | DNS — required for outgoing DNS requests | |
| 443 | TCP | Web interface (HTTPS) | |
| 5060 | TCP/UDP | Kamailio SIP signaling | |
| 5061 | TCP/UDP | Kamailio SIP signaling over TLS | |
| 5050 | TCP/UDP | Asterisk SIP signaling | Used for internal communication. Public inbound can be blocked |
| 3478 | TCP/UDP | STUN/TURN traffic required by ICE for NAT traversal | |
| 10000–20000 | UDP | RTP audio/media traffic | |
| 4000–5999 | UDP | T.38 fax signaling | |
| 11211 | TCP | Hubring, normally localhost | Used for internal communication. Public inbound can be blocked. Open remotely only in distributed environments |