Internet has emerged as an integral part of the modern world. In addition, opportunities for new and innovative use of the Internet are being developed every day. The latest development in this area is the merging of telephony services Internet services. In IP Telephony Services, users are able to make calls with his high-speed Internet connections. In many parts of the world, local telephone services are replaced by VoIP and services to customers and end users are not complaining. In fact, they are in an advantageous position they are able to long-distance calls to other parts of the world, without paying their noses for the same. The market was the traditional stronghold of the institution is slowly but surely opening up the reality is that Voice-over-IP.