The facility of making and receiving calls directly from the desktop computer or a laptop makes the voip technology and SIP Softphone software much popular in the business world. Now one can make and receive calls even while doing some work on their computer. The clarity of audio and the marginally low call rate has made this technology to eliminate the traditional telephone network from the business desks. There are various voip software provider companies who are providing quality and robust SIP Softphone that can provide numerous other advance features other than just sending and receiving calls. They also let user to make customization according to their use and look while purchasing this software.