What Are Relevant Sonicwall Firewall Settings for Switchvox?

If you are having problems registering a phone, or audio issues on phone calls, check these Sonicwall settings: 

Under VOIP > Settings, the following settings should be selected:

• General Settings: Enable consistent NAT (should be checked)

• SIP Settings: Disable SIP Transformations (should not be checked)

If running security:

• Under the security settings you should choose performance over security as a priority. This will increase the performance of the router. 

Exclude or disable single sign-on (refer to this article): 
What do I do if I have audio delay and I am using a Sonicwall firewall?