ZyXEL UAG715 User Guide - Page 214
ALG Technical Reference
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Chapter 18 ALG Table 85 Configuration > Network > ALG (continued) LABEL SIP Signaling Inactivity Timeout DESCRIPTION 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 UAG. SIP Signaling Port Additional SIP Signaling Port (UDP) for Transformations Enable H.323 ALG Enable H.323 Transformations If the SIP client does not have this mechanism and makes no calls during the UAG SIP timeout, the UAG 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. If you are also using SIP on an additional UDP port number, enter it here. Turn on the H.323 ALG to detect H.323 traffic (used for audio communications) and help build H.323 sessions through the UAG's NAT. Select this to have the UAG modify IP addresses and port numbers embedded in the H.323 data payload. H.323 Signaling Port Additional H.323 Signaling Port for Transformations Enable FTP ALG Enable FTP 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. Turn on the FTP ALG to detect FTP (File Transfer Program) traffic and help build FTP sessions through the UAG's NAT. Select this option to have the UAG modify IP addresses and port numbers embedded in the FTP data payload to match the UAG's NAT environment. FTP Signaling Port Additional FTP Signaling Port for Transformations Apply Reset Clear this option if you have an FTP device or server that will modify IP addresses and port numbers embedded in the FTP data payload to match the UAG's NAT environment. If you are using a custom TCP port number (not 21) for FTP traffic, enter it here. If you are also using FTP on an additional TCP port number, enter it here. Click Apply to save your changes back to the UAG. Click Reset to return the screen to its last-saved settings. 18.3 ALG Technical Reference Here is more detailed information about the Application Layer Gateway. ALG Some applications cannot operate through NAT (are NAT un-friendly) because they embed IP addresses and port numbers in their packets' data payload. The UAG examines and uses IP address and port number information embedded in the VoIP traffic's data stream. When a device behind the UAG uses an application for which the UAG has VoIP pass through enabled, the UAG translates the device's private IP address inside the data stream to a public IP address. It also records session 214 UAG715 User's Guide