Maybe I am behind in the pimped-out technology in the work place... But I just encountered this really cool thing we have here at work....
Whenever you get a message on your voicemail, an audio file of the message gets sent to your email. So you listen to your message through your computer.
I had my headphones on, listening to music, and I didn't realize my phone had rang. Then I checked my email and saw the email. I opened it, played the link and listened.