Configuring the Firewall
Configuring Advanced Firewall Settings
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STEP 3  Choose the Upstream Interface (WAN or LAN). Select the interface (LAN or WAN) 
on which the IGMP proxy acts as a normal multicast client.
STEP  4 Click Save.
Configuring LAN (Local Network) Groups
You can create LAN groups, which are groups of endpoints that are identified by 
their IP address. After creating a group, you can then configure actions, such as 
blocked keywords in a firewall rule, that apply to the group. 
(See Configuring URL Blocking, page 86.)
Adding a New LAN Group
To create a LAN Group: 
STEP 1 Choose Firewall > Advanced Settings > LAN (Local Network) Groups.
STEP  2 Click Add.
STEP  3 Enter the group name; spaces and quotes are not supported. Click Save. 
STEP  4 If the group consists of a single IP address, choose Single Address and enter the 
address in the Start IP Address field. If the group consists of a range of IP 
addresses, choose Address Range and enter the addresses in the Finish IP 
Address fields. 
STEP  5 Click Save.
Enabling Session Initiation Protocol Application-Level 
Gateway (SIP ALG)
SIP ALG can rewrite information within SIP messages (SIP headers and SDP body) 
making signaling and audio traffic possible between a client behind Network 
Address Translation (NAT) and the SIP endpoint.