Face time bug has been identified that is blowing up in social media. This appears to be apple’s biggest bug till date. This bug allows users to hear the audio coming from other persons iPhone or iPad before other person answers the call. This makes situation worst if recipient presses volume or power button while call is ringing it will broadcast video in addition to the audio.
The bug appears to affect any IOS devices running on IOS 12.1 or later, currently apple’s server status page shows that “Group facetime is temporally unavailable” so it might be possible apple is trying to fix the bug.
Apple responded saying that they are aware of this issues and have identified a fix that will be released in a software update later this week. Until fix is released it better to disconnect call completely than putting it on silent when you do not want to answer the call to avoid misunderstandings with the caller.