Configuring NAT for a VoIP PBX

Configuration guides, troubleshooting and practical advice for AZTCOFW.

Articles

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Aliases to make it easy

It is easiest to start by making a few entries under Firewall > Aliases to make the rules easier to accomplish: Host alias for the PBX itself, named PBX , containing the local IP address of the PBX. Network or Host alias

Manual Outbound NAT

For Manual Outbound NAT , navigate to Firewall > NAT , Outbound tab, switch from Automatic Outbound NAT to Manual Outbound NAT and press Save . Then at the top of the list, create a rule that looks like so: Interface : W

Port Forwards

For the port forward ( Firewall > NAT , Port Forwards tab), it can be set as follows: Interface : WAN Protocol : UDP (or TCP/UDP if needed) Source : Type Single Host or Alias: SIP_Trunks – or a Any for the type if the SI

Reset States

After making the changes to NAT rules, the states for the PBX must be reset. Navigate to Diagnostics > States Enter the IP address of the PBX and click Filter Click Kill Once the PBX re-registers it test inbound and outb