Mizu Softphone (MizuPhone) is a professional VoIP softphone based on the open standard SIP protocol with an easy to use interface for the Microsoft Windows operating system (Win7 and all the others). With MizuPhone you can connect to any SIP (proxy and/or registrar) server on the public internet or on your local area network. For VoIP beginners: MizuPhone is an internet phone software to make real calls using your PC.
The Mizu VoIP Softphone will integrate seamlessly with your desktop without disturbing you in your everyday work. While you are not in call or chat, it is listening in the background for incoming calls without any impact for your system performance.
MizuPhone is a free softphone for nonprofessional usage.
The professional version cost is $50. Free trial.