My company uses audio conferencing every week. We hold meetings and lectures and sometimes people that need to be in the call can't be due to other appointments. So we have recently started recording our conference calls and playing them back at a different date/time that is conveniant for the people that have missed the original call. This option is great because then the people that missed aren't clueless on what is going on with our business. We get this great service at Eagle Teleconferencing, check them out!