Why am I experiencing issues with WhatsApp Calling?

When experiencing issues with WhatsApp calls, please try connecting to a different network (such as Wi-Fi connection instead of mobile data, or vice versa). Your current network might not be properly configured for UDP (User Datagram Protocol) which may prevent WhatsApp Calling from functioning properly.
If you're unable to make or receive WhatsApp calls after connecting to your Wi-Fi connection, make sure your router's security settings and firewall configuration aren't blocking certain types of connections in order for WhatsApp Calling to function properly.
If you have any additional questions regarding UDP or Firewall settings, please contact your service provider or network administrator for additional information.
Your battery saver and bluetooth connection may also cause issues with WhatsApp calls. If your battery saver is turned on or bluetooth is connected, please try disabling them and let us know if the issue still persists.
Additionally, please restart your device and make sure no other application is using your microphone, earpiece or cameras. Please let us know if you're experiencing the same issue on other applications as well as WhatsApp.
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