Hi ​@user1738, 

If the "Call" button on the desktop app is unresponsive, try the following steps:

1. Restart the App:

   • Close the RingCentral Desktop App completely.
   • Reopen the app and try placing the call again.

2. Clear App Cache:

   • Navigate to Help > Troubleshooting in the app.
   • Click Reset App Data to clear any cached data that might be causing the issue.
   • Log back in and check if the issue persists.

3. Check for Updates:

   • Click your Profile > Check for Updates to ensure you’re running the latest version of the app.
   • Update the app if a new version is available.

4. Ensure Permissions are Enabled:

   • Confirm that the app has the necessary permissions for audio, microphone, and other functions under your computer’s system settings.

5. Reinstall the App:

   • Uninstall the app from your computer.
   • Download and install the latest version from the RingCentral website.

If none of these steps resolve the issue, consider submitting a Support ticket for further assistance. Be sure to provide them with details such as the app version, operating system, and steps to replicate the issue.