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This is something I've had several complaints about and I think it should be seriously considered for an upcoming future release. When an IP phone calls another IP phone - and the person being called is on another call, the calling party's LCD should show a message that reads 'On Another Call'. Many, many, many other systems do this - and for people that don't use Call Manager, or can't use it, its a big deal. Otherwise the calling party will simply go to voicemail and not know the free/busy status - just the call handling mode.