From the cheerful press release:
Imagine not having to stand in the rain or snow to pay for parking at the meter. This free application actually makes it fun to pay for parking. While it is not “Angry Birds,” it will make your parking experience much easier. Simply click through a few easy steps and you’re on your way. The app is so cool; there is even a button or reminder that allows you to extend your parking session remotely. You do not have to run down to the meter to get that extra 15 minutes paid for.
If the operator where you park most often doesn’t currently have CallToPark, you can click on the Send Request button and they will be notified that you are looking for an easier parking alternative or you can use the Map utility and it will show you where the nearest CallToPark location is and what the rates are.