WhatsApp releases voice and video calling feature for desktop client
Almost all features of mobile calling have been carried over
The voice and video calling feature works just like the mobile app. It is available on the WhatsApp Desktop and WhatsApp Web platforms. During calls, a floating window will appear which WhatsApp has designed to stay on top of all other applications. Just like the mobile app, switching from a voice call to a video call and vice versa is also supported.
Phone must also remain connected to the internet during calls
For the feature to work, you will need to be running Windows 10 64-bit version 1903 or newer and macOS 10.13 or newer. WhatsApp also needs access to your camera, speakers, and microphone. The company clarified that your phone must remain connected to the internet for the duration of the call. This is because WhatsApp Desktop syncs messages using your phone.
Can't use smartphone as webcam/mic for WhatsApp Desktop calls
WhatsApp clarifies that virtual audio and video devices aren't supported. Since webcams are selling at inflated prices during the pandemic, many people use their phone as a wireless webcam/mic. Such arrangements won't work for WhatsApp Desktop because a wireless connection sends a data stream to your computer over Wi-Fi. So, your computer's drivers don't detect the audio/video device as physical input.