Kamailio (formerly known as OpenSER) is a free and open-source SIP (Session Initiation Protocol) server. It is used for routing, load balancing, and security in VoIP (Voice over Internet Protocol) and real-time communication platforms. It can handle thousands of calls per second and is highly configurable, making it suitable for various applications, including large-scale VoIP platforms, unified communications, and instant messaging services.
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