Well, this is a problem many businesses have and I assume they will pay for a solution.<p>However, to me it seems like an itch that is very hard to scratch. It all really depends on your execution.
Can you really build a product that doesn't annoy the costumers? If so, then it's an idea worth pursuing.<p>One good way to validate your idea is to look at competitors. Are there any players in this field? Are they making money? Can you provide something better?<p>Another way might be to perform some sort of "smoke test". Build only the software component that calls and talks to people. Then start calling people you know (without them knowing it's you), and have the service ask them simple questions. Do they hang up instinctively? Do they provide any info? You might even want to call them in person afterwards and ask about the experience, though they might not want to speak to you ever again...<p>By the way the site has way too much text.