Using that business phone systems also means people calling in from the outside world, if all of those ports are being used, they will not hear that auto attendant. So I would suggest at the very minimum, you get the same amount, number of ports that you get trunk lines. So if you have four trunk lines coming in, get at least four ports. I mean, this can be a nightmare; it can be really horrible.
That's the basic class, the introduction to telephone systems. If you're going out and you're going to start to try and administer these telephone systems. Like I say, hold on. We're going to have a few more classes before you even try to start touching them. One of the things you have to realize again that makes telephone systems such a pain in the butt. Is especially lower end telephone systems, so we're talking about telephone systems like say $10,000 or less.