MicroSIP is a free open source software for Windows and Linux that enables users to make voice and video calls, send and receive messages, and share files using their internet connection. It supports both SIP and Skype protocols and is compatible with popular services such as Google Voice, MSN, and Yahoo Messenger. It offers features such as audio and video conferencing, call forwarding, call recording, a built-in address book, and more. It also allows users to encrypt their conversations for extra security. With its lightweight and intuitive interface, MicroSIP makes it easy for users to communicate with their contacts regardless of the service used.
It is not a SIP client softphone.