I need my iphone to make some sort of sound (beep, burp, buzz. really anything) when the End Call button is pushed and a call ends. I have had a number of occurrences where I think I've ended a call only to realize that the call did not disconnect. One situation in particular, I ended up leaving part of a very private conversation on my boss' voicemail! I don't know what it is, but sometimes it takes touching the End Call button two or three times to get it to disconnect. I need some sort of audible feedback that I've in fact ended a call. I've tried the sound settings and nothing seems to address this issue. I can get the keyboard to make sounds, but this doesn't extend to the End Call button. Perhaps I've overlooked something really simple?