With the SIP proxy server in the internal, or private, zone, static NAT on the interface to the external, or public, zone is sufficient to allow callers in the public zone to register with the proxy server.
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In this example, phone1 and the SIP proxy server are on the ge-0/0/0 interface in the private zone, and phone2 is on the ge-0/0/2 interface in the public zone. You configure static NAT on the ge-0/0/2 interface to the proxy server to allow phone2 to register with the proxy, then create a policy allowing SIP traffic from the public to the private zone to enable callers in the public zone to register with the proxy, and a policy from the private to the public zone to allow phone1 to call out. See Figure 107.
Figure 107: Proxy in the Private Zone
Use either the J-Web or CLI configuration editor.
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