An SBC (Session Border Controller) is a network element that controls signaling and media streams involved in setting up, conducting, and tearing down calls in a VoIP network. It acts as a gatekeeper, providing security, protocol translation, admission control, and quality of service functions. SBCs are commonly used to connect different VoIP networks, such as an enterprise's internal network to an ITSP (Internet Telephony Service Provider), or to manage call flows between different parts of a large network.
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