Table 128 Advanced > Alg - ZyXEL Communications ZYWALL 2 PLUS User Manual

Internet security appliance

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Table 128 ADVANCED > ALG

Enable H.323

ZyWALL 2 Plus User's Guide

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.

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.

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.

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

Click Apply to save your changes back to the ZyWALL.

Click Reset to begin configuring this screen afresh.

Chapter 23 ALG Screen

Troubleshooting