To dream that you receive the message through the answering machine means that you have the urge to communicate with other people more than you do at the moment. If you left some message on the answering machines during your dream, then such dream indicates some important message you wish to spread to the world.
Dream dictionary: Answering machine message dream meanings
To dream that you see an answering machine means that there is some problem you havent been able to solve. The dream shows that some message is not going though. The answering machine shows that you should tell whatever you want to.