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: WANProtocol: UDP
• Source: Network, PBX
• Source Port: [blank]
• Destination: Network, SIP_Trunks – Or Any for the type if the SIP trunk IP addresses are not known
• Destination Port: PBX_Ports (or leave blank)
• Translation: Interface address if using the WAN IP address, or the external VIP for the PBX
• Port: [blank]
• Static Port: CHECKED