Zyxel-communications 5 Series Bedienungsanleitung PDF herunterladen (Seite 490)

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ZyWALL 5/35/70 Series User’s Guide

490 Chapter 28 ALG Screen

Figure 268 ADVANCED > ALG

The following table describes the labels in this screen.

Table 153 ADVANCED > ALG

LABEL DESCRIPTION

Enable FTP

ALG

Select this check box to allow FTP sessions to pass through the ZyWALL. FTP (File

Transfer Program) is a program that enables fast transfer of files, including large files

that may not be possible by e-mail.

Enable H.323

ALG

Select this check box to allow H.323 sessions to pass through the ZyWALL. H.323 is

a protocol used for audio communications over networks.

Enable SIP ALG Select this check box to allow SIP sessions to pass through the ZyWALL. SIP is a

signaling protocol used in VoIP (Voice over IP), the sending of voice signals over

Internet Protocol.

SIP Timeout 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.

If the SIP client does not have this mechanism and makes no calls during the

ZyWALL SIP timeout (default 60 minutes), the ZyWALL SIP ALG drops any incoming

calls after the timeout period. Enter the SIP signaling session timeout value.

Apply Click Apply to save your changes back to the ZyWALL.

Reset Click Reset to begin configuring this screen afresh.

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