SBC (Session Border Controller)
Was ist SBC (Session Border Controller)?
Dieser Eintrag liegt derzeit nur auf Englisch vor.
An SBC (Session Border Controller) is the network appliance or software layer that sits at the edge of a VoIP network, controlling and securing every SIP call and its media as it crosses from one network to another — for example, between a business's PBX and a carrier's SIP trunk. An SBC handles NAT traversal, protocol normalization between slightly different SIP implementations, encryption, and protects the network behind it from toll fraud and denial-of-service attacks.
More detail
Because SIP implementations vary slightly between vendors, an SBC commonly normalizes signaling differences so a PBX and a carrier's trunk can interoperate cleanly despite not being from the same vendor.
SBCs are a standard chokepoint for encrypting media (SRTP) and signaling (TLS) on calls crossing the public internet, and for rate-limiting or blocking suspicious call patterns associated with toll fraud.
Häufige Fragen
- Why does a business need an SBC if it already has a firewall?
- A standard firewall isn't built to inspect and manage real-time SIP signaling and media the way an SBC is — an SBC understands the call-control protocol itself, handling NAT traversal, encryption, and toll-fraud protection that a generic firewall doesn't provide.
- What's the difference between an SBC and a softswitch?
- An SBC secures and normalizes SIP signaling and media at the network edge; a softswitch makes the actual routing decision — which network or carrier a call should go to next. Many production deployments use both together.
See also
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