MicroSIP is an open-source, portable SIP softphone designed for Windows operating systems, built on the PJSIP stack. It enables high-quality VoIP communication, facilitating both person-to-person calls and calls to standard telephones using the open SIP protocol. Users can select from a variety of SIP providers available in the cloud, create an account, and seamlessly integrate it with MicroSIP, allowing for free local calls and affordable international calling options. The software is developed in C and C++, ensuring minimal usage of system resources while remaining user-friendly for everyday tasks. It incorporates advanced features such as a WebRTC echo cancellation algorithm and voice activity detection, along with configurable encryption options like TLS and SRTP for secure control and media transmission. Notably, MicroSIP does not require additional dependencies and saves user settings in an ini file for easy access. It also supports multiple languages and right-to-left text, making it accessible for users with visual impairments who utilize screen reader software like NVDA. Furthermore, its localization capabilities encompass a wide range of languages, including Brazilian, Bulgarian, Chinese, Dutch, Estonian, Finnish, French, German, Hebrew, Hungarian, Italian, Korean, Norwegian, Polish, Russian, Spanish, Swedish, and more, catering to a diverse global audience.