Internet Microphone?

I'd like to monitor the operation of a piece of machinery at a remote location. It's a backup generator which runs for 10 minutes each week to exercise and self-test. When I'm at the site I monitor it by listening to the racket it makes and so an Internet accessible microphone server sounds ideal, but all I can find are IP webcams with built-in microphones, which seem a waste of money. Any black box (non-soldering iron) suggestions?

Tony