Facetime made few phone calls on its own to random people on my address book on my iphone5s with iOS9. Quickly hang up when video calling people on my PJ Then it does not seem to show any record of any recent calls. This happens sometimes not often.
Also been received missed FaceTime calls from other people I know randomly by mistake as well on iphone6. So does not seem to only just happen to me.
Could not uncover answer from Google.
Is there a bug?
Interesting, I received a call yesterday morning at 7am from some random person claiming they are calling me back because I tried to call them. I dismissed it as someone with the wrong number and maybe crazy. I checked my call logs later that day and I had attempted to facetime that number twice 10 minutes prior to them calling me and I was most definitely asleep. I figured it was just an anomaly until I just read your post. It is an iPhone 4 on an outdated iOS maybe 7. The only difference to your story is that I can see the attempted calls in the logs.