In the least, you can hear my voice. At the most, you can leave a sexy message. At the ubermost, you can hax0r my voicemail and do something hax0ry with my umm... voicemail. Yeah, real challenge, real reward. I'm being sarcastic, but hey, isn't that the idea behind the DoS attacks on DALnet?
Feel free to find the happy medium between the least and the most.