This is the motto of ether, a company backed by the same investors as Ebay and Skype. All you have to do is setup a free Ether Phone Number, set a rate and when people call, you get paid. The rate you set is up to you. You can charge per minute or per call.
There are also other web sites out there that help trainers/advisors monetize their experience. Two of them are BitWine and TWL. Although not voice oriented like ether, these sites offer good tools to their subscribers.