Make a FaceTime audio call using Messages on Mac
In Messages, you can start a FaceTime audio call to one or more people who have a Mac, iOS device, or iPadOS device that meets these requirements.
Note: You need to sign in to FaceTime using your Apple ID and make sure FaceTime is turned on.
In the Messages app on your Mac, select a conversation.
Click the Video button in the top-right corner of the window.
Choose FaceTime Audio to immediately start the call.