When you locate the SIP proxy server in an external, or public, zone, static NAT configured on the interface to the public will enable callers in the internal, or private, zone to register with the proxy.
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In this example, phone1 is on the ge-0/0/0 interface in the private zone, and phone2 and the proxy server are on the ge-0/0/2 interface in the public zone. You configure static NAT on the ge-0/0/2.0 interface to phone1, then create policies that allow SIP traffic from the public zone to the private zone, and reference the static NAT in the policy. This example is similar to the (Configuring Interface Source NAT for Incoming SIP Calls and Configuring a Source NAT Pool for Incoming SIP Calls, except that with static NAT you need one public address for each private address in the private zone, while with a DIP pool a single interface address can serve multiple private addresses. See Figure 106.
Figure 106: Static NAT for Incoming Calls
To configure static NAT for incoming calls, use either the J-Web or CLI configuration editor.
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