Firewall Protection
151
ProSecure Unified Threat Management (UTM) Appliance
4. Click Apply to save your settings.
Manage the Application Level Gateway for SIP Sessions
The application level gateway (ALG) facilitates multimedia sessions such as voice over IP
(VoIP) sessions that use the Session Initiation Protocol (SIP) across the firewall and provides
support for multiple SIP clients. ALG support for SIP is disabled by default.
 To enable ALG for SIP:
1. Select Network Security > Firewall > Advanced. The Advanced screen displays (see
the following figure).
2. Select the Enable SIP ALG check box.
3. Click Apply to save your settings.
Figure 84.
User Limit Enter a number to indicate the user limit.
If the User Limit Parameter is set to Percentage of Max Sessions, the number
specifies the maximum number of sessions that are allowed from a single-source
device as a percentage of the total session connection capacity of the UTM. (The
session limit is per-device based.)
If the User Limit Parameter is set to Number of Sessions, the number specifies an
absolute value.
Note: Some protocols such as FTP and RSTP create two sessions per connection,
which should be considered when configuring a session limit.
Total Number of
Packets Dropped due
to Session Limit
This is a nonconfigurable counter that displays the total number of dropped packets
when the session limit is reached.
Session Timeout
TCP Timeout For each protocol, specify a time-out in seconds. A session expires if no data for
the session is received for the duration of the time-out period. The default time-out
periods are 1200 seconds for TCP sessions, 180 seconds for UDP sessions, and
8 seconds for ICMP sessions.
UDP Timeout
ICMP Timeout
Table 31. Session Limit screen settings (continued)
Setting Description
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