ZyXEL Communications USG40W - How to Configure the USG When Using a Cloud Based SIP System

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How to configure the USG when using a Cloud Based SIP
system
This example shows how to configure USG when there is a Cloud Based SIP system. The
IP phones are more and more popular nowadays. USG supports the scenario as IP
phones located in LAN and connect to internet to register the SIP server.
Figure 202 SIP Phone connects to SIP server via USG.
int
er
ne
t
USG
WAN IP
10.251.3
0.94
LAN IP
192.168.
1.1
SIP
server
IP
10.25
1.30.5
8
IP
Phone
A
IP
192.1
68.1.3
3
IP
Phone
B
IP
192.1
68.1.3
4
IP
Phone
C
IP
192.1
68.1.3
5
Note: All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses and subnet masks. This example
was tested using USG210 (Firmware Version: ZLD 4.20).