Voicemail
If someone were to leave you a voicemail the system automatically emails you right away to let you know you have a voicemail.
This is what it looks like:
You can see this by clicking on Advanced tab on the Navigation bar (at top) then click on Voicemail.
You can also change it to forward the call to your cell phone or office number by clicking the bubble that says Call Forwarding and then clicking the Update button below that.