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?
