3Com VoIP setup - PBX and / or clients connecting over VPN
To configure "3Com VoIP setup - PBX and / or clients connecting over VPN" ensure that the following settings are enabled on the SonicWall Appliance.
Go to Firewall > Multicast Under Multicast Snooping section: Select Enable Multicast Under Multicast Policies section: In the Drop down list Select Enable reception of all multicast addresses Click Apply button on top.
Go to Network > Interfaces Edit the LAN Interface settings by click on the Configure icon. The Edit Interface window is displayed. Click on Advanced Tab, Select Enable Multicast Support Click Apply
Go to VPN > Settings Edit the VPN policy, go to Advanced tab and select Enable Multicast Support Click Apply.
Go to VPN > Advanced Select Enable Fragmented Packet Handling Uncheck Ignore DF (Don't Fragment) Bit Click Apply
Go to VoIP > Settings Uncheck Enable H.323 Transformations, Note: This required a reboot Reboot the SonicWall Appliance