What is sip stack?

A SIP stack refers to a software library or framework that implements the Session Initiation Protocol (SIP), which is used for initiating, maintaining, and terminating real-time communication sessions, such as voice and video calls over IP networks. The SIP stack handles various aspects of the protocol, including message formatting, transmission, and session management, allowing developers to build applications like VoIP services, video conferencing systems, and instant messaging platforms. It typically includes components for both signaling and media handling, enabling seamless communication between different endpoints.