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A session border controller (SBC) is an interface to a network firewall that facilitates the secure hand-off of voice packets from one IP network to another IP network. In an enterprise network, the SBC "controls" the communications "session" as it crosses the "border" from the LAN to IP. Conventional firewalls support the secure traversal of data streams, but for IP networks, SBCs are needed to facilitate secure, real time, multimedia communication. SBCs are a recent, but important component in today's nextgen network infrastructure.
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