SIP
SIP (Session Initiation Protocol) is an application-layer signaling protocol used to establish, modify, and terminate multimedia communication sessions over IP networks, such as voice and video calls, instant messaging, and online gaming. It operates independently of the underlying transport layer and is a core component of Voice over IP (VoIP) and unified communications systems. SIP enables features like call routing, user location, session management, and presence information.
Developers should learn SIP when working on real-time communication applications, VoIP systems, or telephony integrations, as it provides a standardized way to handle multimedia sessions. It is essential for building scalable and interoperable communication platforms, such as softphones, PBX systems, or video conferencing tools, and is widely used in telecommunications and enterprise solutions.