Your current phone system is designed to cost you more.
Your current phone service is set up in a way that requires you to pay for phone lines you barely use. You pay for these lines to ensure that your customers don't hear busy signals during the busiest time of the day. You pay for lines to ensure that your company can reach your customers at the same time they're calling in. That means you are paying for phone lines that are used occasionally, when all you need is the ability to pay for the lines you need on demand, when they're needed. That's where VoIP comes in.