In other words, this is a bug that you can't control from your end, because it's triggered by the activation of a feature in the app by the person who initiated the call.
A serious bug in Apple's Facetime video calling software could allow people to listen to you via your phone's microphone - without you picking up a call. Without the recipient answering the phone, audio from the other user's phone is then streamed to the caller. Yes, you can call someone and listen to them even if they don't attend your call. And Apple responded on Monday evening by turning off FaceTime Group Chatting from the server to effectively kill the bug and render FaceTime chatting useless until Apple launches a fix. In the meantime, you may want to consider disabling FaceTime on your iOS device.
Users took to Twitter to tweet jokes and comments about the bug affecting Apple's group FaceTime service. The issue affects any pair of iPhones running iOS 12.1 or later, but also calls made to Macs using Mojave.
The bug emerged on Data Privacy Day when Apple Chief Executive Officer Tim Cook called for "action and reform for vital privacy protections".
The issue occurs when a user phones someone using FaceTime, then swipes to add another person to the call and adds their own number.
A new Group FaceTime bug allows callers to see and hear the person they're calling before they've even answered.
In some cases, the target iPhone would send video, probably without the receiver's knowledge, the BBC reported.
"The FaceTime bug is an egregious breach of privacy that puts New Yorkers at risk", Governor Cuomo said in the statement.
To disable the FaceTime app temporarily, users can go to Settings, select FaceTime and then toggle it to off until a patch has been issued.
As always, bugs happen, so all we can do is wait and see how well and quickly Apple fixes it.