You are using an unsupported browser. Please update your browser to the latest version on or before July 31, 2020.
Home > ThinkTel Support > Troubleshooting > Dropped Calls > Dropped calls when using a Sonicwall 2040
Dropped calls when using a Sonicwall 2040
print icon

If you are experiencing dropped calls, this is probably the result of SIP ALG (application layer gateway) functionality being active. Basically, the firewall is mangling SIP packets, of which our switch rejects. Often by cancelling the phone call.

To fix this, disable the "Enable SIP Transformations" option in the VOIP tab in your Sonicwall's admin panel.

0 out of 0 found this helpful

scroll to top icon