Q: Cannot clear Facetime's "red dot" of missed calls.  Help!

Mine was doing the same thing.  Nothing worked, even when I "cleared" it.  Finally, I just left it and restarted the computer (Shut down and restart).  It is gone, and there is no more red number.

Argg! This happened to me as well. Quitting FaceTime doesn't clear the missed call badge, so this is still a bug in 10.8.2

FIrst try to deactivate FaceTime and activating again.

Have you tried to reproduce the issue using other user acocunt on Mac OS X? If the new user does not duplicate the issue, go to Finder (using your account) and then ~/Library/Preferences and move com.apple.FaceTime.plist to trash and restart your computer. If you this new user is having the same issue, has to Repair Disk Permissions using Disk Utility.

delete the item(missed call) from the list.

What item list? There's only one window in FaceTime, the video chat window, and it doesn't have a list in it.

I'm sure that deleting the preferences, and the rebooting will fix the issue, but if that's the only way to clear the badge off the icon, then this is a real bug.

Oh, I see, there's a missed calls item in the contextual menu you get when right clicking on the dock icon.

Sadly, that just shows a darkened screen with nothing on it. Clicking on that screen takes me back to the Finder, where the badge persists to taunt me.

I get this issue in Mavericks as well. Cannot get rid of it at all

Be sure to check for audio only calls, that fixed it for me.

I  Found that I was able to clear the red dot by deleting all the missed calls from both the face time and audio only lists. 

HOWEVER, this behavior is inconsistent with how the iPhone "phone" app hanldes missed calls where it will clear the red dot by simply reviewing the missed call list.  I should not have to delete missed calls individually because I may still want the record of those calls even though I missed them.

This is, of course, pertaining to iOS 8 for me as this is when apple introduced answering phone calls on your iPhone with your iPad.

This is a Bug in the Latest iOS8.1.

After calling the Missed caller back,

The Solution is to go to Settings/Facetime/ slide off/ Reboot/ Repeat and slide Facetime back on.
This should clear notifications until the Fix arrives in the next facetime Update. Its disappointing, because its a simple fix in the code.

^_^

This just worked for me On my ipad

FOr IoS 8.3, in FaceTime change from video to audio and the missed call should appear with edit button, click edit and you can select the call or calls and at the bottom of screen press delete.

TThis worked, thanks!