ZyXEL ZyWALL USG 2000 User Guide - Page 406
Table 101
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Chapter 21 ALG The following table describes the labels in this screen. Table 101 Configuration > Network > ALG LABEL DESCRIPTION Enable SIP ALG Turn on the SIP ALG to detect SIP traffic and help build SIP sessions through the ZyWALL'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 Chapter 32 on page 521). Enable SIP Select this to have the ZyWALL modify IP addresses and port numbers Transformations embedded in the SIP data payload. Enable Configure SIP Inactivity Timeout SIP Media Inactivity Timeout 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 apply SIP media and signaling inactivity time out limits. Use this field to set how many seconds (1~86400) the ZyWALL will allow a SIP session to remain idle (without voice traffic) before dropping it. SIP Signaling Inactivity Timeout If no voice packets go through the SIP ALG before the timeout period expires, the ZyWALL deletes the audio session. You cannot hear anything and you will need to make a new call to continue your conversation. Most SIP clients have an "expire" mechanism indicating the lifetime of signaling sessions. The SIP user agent sends registration packets to the SIP server periodically and keeps the session alive in the ZyWALL. SIP Signaling Port Enable H.323 ALG Enable H.323 Transformations If the SIP client does not have this mechanism and makes no calls during the ZyWALL SIP timeout, the ZyWALL deletes the signaling session after the timeout period. Enter the SIP signaling session timeout value (1~86400). If you are using a custom UDP port number (not 5060) for SIP traffic, enter it here. Use the Add icon to add fields if you are also using SIP on additional UDP port numbers. Turn on the H.323 ALG to detect H.323 traffic (used for audio communications) and help build H.323 sessions through the ZyWALL's NAT. Enabling the H.323 ALG also allows you to use the application patrol to detect H.323 traffic and manage the H.323 traffic's bandwidth (see Chapter 32 on page 521). Select this to have the ZyWALL modify IP addresses and port numbers embedded in the H.323 data payload. H.323 Signaling Port Additional H.323 Signaling Port for Transformations You do not need to use this if you have a H.323 device or server that will modify IP addresses and port numbers embedded in the H.323 data payload. If you are using a custom TCP port number (not 1720) for H.323 traffic, enter it here. If you are also using H.323 on an additional TCP port number, enter it here. 406 ZyWALL USG 2000 User's Guide