When active on a call - I hear the call waiting beep, however no number displays and does not even look as though another call is coming through ... when disconnected from the first call - the "missed call" does not appear in the call log (so you have no idea who was calling) ... this happens every few calls ... I have talked to tech support who claim they have not heard about this issue before - but if you Google it, it appears several people have the issue - with no resolution ... tech support did some troubleshooting & when they made a test call of course it worked because the issue is intermittent. PLEASE someone provide me with a resolution - missing way too many business & personal calls & at this point it is frustrating!!!