What's wrong? Don't want the party to know you're ignoring them??? LoL, anyone who calls me knows if I don't answer my phone I'm either on another call or I'm ignoring them as I ALWAYS have it on my hip. If I can't talk I just send it to voicemail, I don't care what they think, sometimes I'm just too busy to have a 15 minute conversation with someone...
That being said, I can see why it would be a missed feature for some...