ZyXEL Communications 1000 User Manual

Chapter 7 Tutorials

ZyWALL USG 1000 User’s Guide

Create a host address object named IPPBX-Public for the public WAN IP address 
1.1.1.2. 

Figure 121   Creating the Public IP Address Object   

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 ge2. 
• 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 

 for details).