A feature called SIP Application-Layer Gateway, or SIP ALG, is known to cause issues with VoIP Communication.  Vantage Unified has created this article to assist with properly configuring your SonicWall device.

Step-by-step guide

Complete the following steps to properly configure your SonicWall device.  Note: These images may differ from the current version of software.

  1. Log into the device’s web configuration utility
  2. Select VoIP, Settings
  3. Check Enable consistent NAT
  4. Uncheck all other Settings
  5. Click Accept

 

SonicWall Support

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

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