Presently, if someone make you WhatsApp call in the midst of talking to another WhatsApp call, you get only missed call notification only but now WhatsApp has rollout of an update which offers a call waiting feature but unlike in real call waiting feature, you can hold regular while receiving another call, this call waiting feature on WhatsApp will now allow to hold your regular call. You have option to accept this second incoming call in waiting and disconnect the existing regular call or you can just decline the call waiting call
Call waiting feature on WhatsApp is now available in version 2.19.352 of the stable Android app, as well as version 2.19.357 and version 2.19.358 of the beta app.
In addition to call waiting, this new WhatsApp update also empowers you to decide who can add you to a WhatsApp call. You can check this out by following this path: Account > Privacy > Groups in the settings menu.
