Yes if you do Direct Routing, multi-carrier SIP Trunks, or want enterprise-grade voice security.

What Is SBC?

Q: How is SBC different from a firewall

A regular firewall covers Layers 3-4. SBC handles Layer 7 SIP / RTP, enabling voice-specific protection and codec transcoding.

Q: Hardware SBC vs Software SBC

Hardware SBCs start around 50,000 THB, support more channels, and include dedicated DSPs. Software SBCs (e.g., Ribbon SWe) run on VMs and price scales by channel count. Often interchangeable.

2026-05-07 3 min readSIPPER Team

An SBC is a border device between two voice networks on IP. It is used to connect customer PBX to carriers, enable Microsoft Teams Direct Routing, and bridge SIP Trunks.

Definition

SBC (Session Border Controller) handles security (voice-aware firewall), NAT traversal, topology hiding, codec transcoding, and survivability if a carrier fails.

Usage

Used by organizations connecting multi-carrier SIP Trunks, Microsoft Teams Direct Routing, or multi-site contact centers. Example products: AudioCodes Mediant, Ribbon SBC, Oracle ESBC, Sangoma NetBorder.

Related Concepts

Unlike a regular firewall, an SBC understands SIP / RTP and performs deep packet inspection, defending against voice-specific attacks like INVITE flood and toll fraud.

Frequently Asked Questions

How is SBC different from a firewall

Is an SBC necessary

Hardware SBC vs Software SBC

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