ZyXEL Communications ZyWALL 1100 User Manual page 283

Figure 191 Configuration > Network > ALG
The following table describes the labels in this screen.
Table 120 Configuration > Network > ALG
LABEL
Enable SIP ALG
Enable SIP
Transformations
Enable Configure SIP
Inactivity Timeout
SIP Media Inactivity
Timeout
Chapter 14 ALG
DESCRIPTION
Turn on the SIP ALG to detect SIP traffic and help build SIP sessions through the
ZyWALL/USG's NAT. Enabling the SIP ALG also allows you to use the application
patrol to detect SIP traffic and manage the SIP traffic's bandwidth (see
on page 427).
Select this to have the ZyWALL/USG modify IP addresses and port numbers
embedded in the SIP data payload.
You do not need to use this if you have a SIP device or server that will modify IP
addresses and port numbers embedded in the SIP data payload.
Select this option to have the ZyWALL/USG apply SIP media and signaling inactivity
time out limits.
Use this field to set how many seconds (1~86400) the ZyWALL/USG will allow a SIP
session to remain idle (without voice traffic) before dropping it.
If no voice packets go through the SIP ALG before the timeout period expires, the
ZyWALL/USG deletes the audio session. You cannot hear anything and you will need
to make a new call to continue your conversation.
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Chapter 26