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Chapter 18 ALG
ZyWALL USG 100/200 Series User’s Guide
329
Figure 236 Network > ALG
The following table describes the labels in this screen.
Table 108 Network > ALG
LABEL DESCRIPTION
Enable SIP
Transformations
Turn on the SIP ALG 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. Enabling the SIP ALG allows you to use bandwidth management
on SIP traffic.
SIP Signaling
Port
If you are using a custom UDP port number (not 5060) for SIP traffic, enter it here.
Additional SIP
Signaling port
(UDP) for
transformations
If you are also using SIP on an additional UDP port number, enter it here.
SIP Media
inactivity time
out
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.
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.
SIP Signaling
inactivity time
out
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, the ZyWALL deletes the signaling session after the timeout
period. Enter the SIP signaling session timeout value (1~86400).
Enable H.323
transformations
Turn on the H.323 ALG to allow H.323 sessions (used for audio communications) to
pass through the ZyWALL. Enabling the H.323 ALG allows you to use bandwidth
management on H.323 traffic.
H.323 Signaling
Port
If you are using a custom TCP port number (not 1720) for H.323 traffic, enter it here.
Additional H.323
Signaling port
for
transformations
If you are also using H.323 on an additional TCP port number, enter it here.