Firstly, there is a significant cost difference for VoIP calls, you often won't need to pay flagfalls on your calls, you can even be billed for individual seconds on a call rather then in 30 or 60 second blocks. You can easily handle multiple calls at the same time, you can have queues for your extra calls with hold music and call back options. Customers can call directly to extensions or certain teams. You have a lot more control over how calls are handled by your business. If you want to record phone calls this can also be easily achieved, you can use this to track effectiveness of different advertising strategies.