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Open the chat window of the user you want to voice call/audio call.
Click to find Audio Calling feature icon as directed by the arrow from the figure below.
A small pop-up layout(splash board) is opened.
Click on Audio as directed by the arrow from the figure below.
A confirmation pop-up window is opened at the top of the chat window.
Click Yes as directed by the arrow from the figure below.
You will be directed to audio-selection prompt page.
Select either Default, or Built-in Microphone as shown in the figure below.
Click Next as directed by the arrow from the figure below.