ZyXEL Communications ZyWall ATP series User Manual page 350

Figure 240 Configuration > Network > ALG
The following table describes the labels in this screen.
Table 141 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 Zyxel
Device'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
496).
Select this to have the Zyxel Device 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 Zyxel Device apply SIP media and signaling inactivity time
out limits. These timeouts will take priority over the SIP session time out "Expires" value in
a SIP registration response packet.
Use this field to set how many seconds (1~86400) the Zyxel Device 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 Zyxel
Device deletes the audio session. You cannot hear anything and you will need to make
a new call to continue your conversation.
ZyWALL ATP Series User's Guide
350
Chapter 26 on page