Debugging VOIP Calls


TopView supports making voice calls through VOIP. This requires a network connection between the TopView machine and the VOIP/SIP Server.

Once the correct credentials are configured calls may still fail due to firewalls or port restrictions between TopView and the VOIP/SIP Server.

VOIP Firewall Checker

The 3CX firewall checked can help diagnose firewall or port issues between TopView and the VOIP SIP Server.

Download the 3CX Firewall Checker

The firewall checker is available from 3CX.

  • Click on the link that says “Download the 3CX Firewall Checker Application” to download the zip file
  • Extract the files in the zip
  • On the TopView machine, run the application RemoteConnectionTest.exe for 32 or 64-bit machines

Running the 3CX Firewall Checker application

In this example, we ran the checker against a Grandstream VOIP device located in our office.

3cx Firewall Checker
  • 3CX Server IP Address: port
    Enter the IP address or hostname of the SIP Server. If you are not using the default SIP port (5060) enter:port after the SIP Server
  • Extension
    Enter the phone extension that you plan to use in TopView.
    In the TopView Voice Notification setting, this field is named “User name”
  • Authentication ID
    Enter the registration name.
    In the TopView Voice Notification settings, this field is named “Authorization name”
  • Password
    Enter the password for the registration name/Authentication ID.
  • Echo text extension
    Enter the number that you wish to call through the SIP Server. In our example, the Grandstream is configured to make external calls through the analog phone line if the number starts with a 5.
  • Callback test extension
    Do not enter anything here
  • Click [Start test]
    Perform a test call and report any discovered problems. If the test works you should receive a call at the entered “Echo test extension”. If you receive a call you can ignore the Echo Call: Failed! result since the number you called does not perform an echo.