The messaging platform is expected to release the stable build update with these features in the coming months. Also Read - Eid-Ul-Fitr 2021: How to send Eid Mubarak wishes Stickers on WhatsApp
WhatsApp Web video, voice calls screenshots
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These buttons will be located inside of the chat header, in a similar fashion to how they show up inside of the mobile version of WhatsApp. The app will pop-up a small box in case a user is receiving a call, from which they will be able to accept or decline them.
To recall, WABetaInfo back in December had reported that WhatsApp was rolling out beta calls for specific users from its long list of beta testers.