When you locate the SIP proxy server in an external, or public, zone, you will typically want to configure NAT on the interface to that zone.
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In this example, phone1 is on the ge-0/0/0.0 interface in the private zone, and the proxy server and phone2 are on the ge-0/0/2.0 interface in the public zone. You configure source NAT on interface 0/0/2.0 in the public zone, then create a policy permitting SIP traffic from the public zone to the private zone and reference the NAT interface. You also create a policy from private to public to allow phone1 to register with the proxy server in the public zone. See Figure 120.
Figure 120: Proxy in the Public Zone
To configure the SIP proxy in the public zone, use either the J-Web or the CLI configuration editor.
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