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  • Disable SIP ALG on SonicWall Devices

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Also will need to change the UDP timeout Under Firewall > Advanced
- Set UDP Connection Timeout to 120 seconds

 

Once you change the setting to 120 seconds go under Firewall --> Access Rules

Select your Lan --> Wan and click Edit

Under Advanced Tab 

  • UDP Connection Inactivity Timeout (seconds): 30

Change to:

  • UDP Connection Inactivity Timeout (seconds): 120

Do the same for Wan --> to Lan

 

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Info

SonicWall Support

http://help.mysonicwall.com/sw/eng/1531/ui2/13000/Firewall/VoIP.htm

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