Protocols BroadNet answer

What is an SBC (Session Border Controller)?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

An SBC (Session Border Controller) is the security and control element that sits at the edge of a VoIP network, policing SIP signaling and RTP media as they cross between networks. It handles NAT and firewall traversal, hides internal topology, enforces call admission and rate limits, transcodes codecs when two sides differ, and defends against SIP-based attacks and toll fraud. Every serious SIP trunking and voice-API deployment sits behind one. See /answers/what-is-sip, /answers/what-is-nat-traversal, and /answers/voice-api-sip-trunking.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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