Voipbusterpro is a fraudulent company. I've subscribed with voipbusterpro.com for about 50 days. It shows it can call by using their computer program, SIP device, website phone to phone. I've paid 10 Euros via paypal. Now, I couldn't place a call by any way that they supplied. It shows "call ended ( the other part rejected call)" or "Call ended due to an unknown error". I've contacted their customer service via their website, it seems it is the only way the customer can reach them. But no response at all. Their tricky is to supply service at first 50 days. The Paypal can only report a problem within 45 days. They got money and do not supply any service to the buyers.