ZyXEL Communications ISG50, Примечание к применению

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Scenario 1 - ISG50 is placed behind an existing ZyWALL
1.1 Application Scenario
For companies with existing network infrastructures and demanding
VoIP requirements, you can connect the ISG50 to the LAN or DMZ of
the ZyWALL. The USG provides security services and the ISG50 acts as
a pure IP PBX to provide VoIP services.
Goal to Achieve
IP phones from the Internet can register to ISG50 through USG’s
WAN IP and can talk to another IP phone which is connected under
ISG50’s LAN zone.