Setup A Nat Policy For The Ippbx - ZyXEL Communications ZYWALL USG 20 Manual

Chapter 7 Tutorials
Create a host address object named IPPBX-Public for thepublic WAN IP address
2
1.1.1.2.
Figure 99 Creating the Public IP Address Object

7.11.3 Setup a NAT Policy for the IPPBX

Click Configuration > Network > NAT > Add.
• Configure a name for the rule (WAN-DMZ_IPPBX here).
• You want the IPPBX to receive calls from the WAN and also be able to send calls
to the WAN so you set the Classification to NAT 1:1.
• Set the Incoming Interface to wan1.
• Set the Original IP to the WAN address object (IPPBX-Public). If a domain
name is registered for IP address 1.1.1.2, users can use it to connect to for
making SIP calls.
• Set the Mapped IP to the IPPBX's DMZ IP address object (IPPBX-DMZ).
• Set the Port Mapping Type to Port, the Protocol Type to UDP and the
original and mapped ports to 5060.
• Keep Enable NAT Loopback selected to allow the LAN users to use the IPPBX
(see NAT Loopback on page 343
142
for details).
ZyWALL USG 20/20W User's Guide