ZyXEL Communications ZYWALL USG 20 Manual page 356

Chapter 19 ALG
Table 98 Configuration > Network > ALG (continued)
LABEL
Enable Configure
SIP Inactivity
Timeout
SIP Media
Inactivity
Timeout
SIP Signaling
Inactivity
Timeout
SIP Signaling
Port
Additional SIP
Signaling
Port(UDP) for
Transformations
Enable H.323
ALG
Enable H.323
Transformations
H.323 Signaling
Port
Additional H.323
Signaling Port
for
Transformations
Enable FTP ALG
Enable FTP
Transformations
FTP Signaling
Port
356
DESCRIPTION
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.
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.
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.
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 ZyWALL's
NAT.
Select this to have the ZyWALL modify IP addresses and port numbers
embedded in the H.323 data payload.
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 ZyWALL's NAT.
Select this option to have the ZyWALL modify IP addresses and port
numbers embedded in the FTP data payload to match the ZyWALL's
NAT environment.
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 ZyWALL's NAT environment.
If you are using a custom TCP port number (not 21) for FTP traffic,
enter it here.
ZyWALL USG 20/20W User's Guide