Before You Begin; The Alg Screen - ZyXEL Communications ZyWALL USG 300 User Manual

18.1.3 Before You Begin

You must also configure the firewall and enable virtual server in the ZyWALL to
allow sessions initiate from the WAN.

18.2 The ALG Screen

Click Network > ALG to open the ALG screen. Use this screen to turn ALGs off or
on, configure the port numbers to which they apply, and configure SIP ALG time
outs.
Note: If the ZyWALL provides an ALG for a service, you must enable the ALG in order
to use the application patrol on that service's traffic.
Figure 214 Network > ALG
The following table describes the labels in this screen.
Table 97 Network > ALG
LABEL
SIP Setting
Enable SIP
Transformations
ZyWALL USG 300 User's Guide
DESCRIPTION
Turn on the SIP ALG to detect SIP traffic and help build SIP sessions
through the ZyWALL's NAT. The ZyWALL modifies IP addresses and
port numbers embedded in the SIP data payload. Enabling the SIP ALG
also allows you to use the application patrol to detect SIP traffic and
manage the SIP traffic's bandwidth (see
the application partol).
Chapter 18 ALG
Chapter 29 on page 467 for
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