In a two-zone scenario with the SIP proxy server in an external, or public zone, you can use NAT for incoming calls by configuring a NAT pool on the interface to the public zone.
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In this example, phone1 is in the private zone, and phone2 and the proxy server are in the public zone. You configure a source NAT pool on the ge-0/0/2.0 interface to do NAT on incoming calls, then set a policy permitting SIP traffic from the public zone to the private zone and reference the NAT pool in the policy. You also create a policy that permits SIP traffic from the private to the public zone.. This enables phone1 in the private zone to register with the proxy in the public zone. See Figure 105.
Figure 105: Source NAT Pool for Incoming Calls
To configure a source NAT pool for incoming calls, use either the J-Web or CLI configuration editor.
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