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OpenSIPS is an open-source Session Initiation Protocol server for voice over IP (VoIP) communications. It serves as a central router that creates, modifies and terminates calls between users or to outside networks. OpenSIPS can handle thousands of calls per second and supports features like user authentication, number translation, load balancing across multiple servers, and failover support in case of network disruption or hardware failure. The software can be used to set up both voice communication with audio codecs and video calls with video codecs within VoIP systems.