What do the actions of Busy, Disconnected, etc. actually do?

[SomeWhoCallMeTim]

Good idea. They get the standard "We're sorry this number [is no longer in service| has been disconnected]..."

[Tooth]

For fun, you also might like to forward telemarketing calls to some of the numbers listed here:

http://moo.net/numbers.html

The number for Echo test is an especially funny one: 909-390-0003.