AudioCodes Mediant 500 SBC – 1 T1/E1 Interface, SIP Session Border Controller for Branch & SMB VoIP Deployments (M500-V-1ET)

The AudioCodes Mediant 500 (M500-V-1ET) is a compact Session Border Controller with an integrated T1/E1 digital voice interface. Combining SBC security and SIP session management with a single T1 or E1 span (up to 24 T1 or 30 E1 channels), it provides branch offices and SMBs with a single device that bridges TDM PSTN circuits to SIP-based VoIP infrastructure while enforcing SIP security at the network edge. It is designed for deployments where SBC and TDM gateway functions are both needed in a compact, cost-efficient form factor.

The Telecom Spot Take

Many branch office and SMB deployments have a single T1 or PRI circuit that needs to connect to a hosted UCaaS or SIP trunking service — and also need SBC protection on the SIP side. Deploying a separate TDM gateway and a separate SBC adds cost and complexity. The Mediant 500 with the T1/E1 interface handles both in one box: TDM-to-SIP conversion plus SIP session border control in a single 1U platform. For organizations standardizing on Microsoft Teams or a hosted UC platform while maintaining a PSTN PRI for fallback or high-density calling, the M500-V-1ET is the practical single-device solution. The 1-span capacity (24 T1 or 30 E1 channels) handles the concurrent call load of a typical SMB or branch office without oversizing the hardware.

Key Features

• Integrated SBC + T1/E1 gateway — single device handles both TDM-to-SIP conversion and SIP session border control
• 1 T1/E1 span — 24 simultaneous T1 channels or 30 E1 channels for PSTN/PBX trunk connectivity
• SIP security — topology hiding, TLS/SRTP, DoS protection, and SIP normalization
• Compact 1U form factor — sized for branch IDF closets and SMB server rooms
• Cost-effective consolidation — eliminates separate TDM gateway and SBC hardware investment
• SIP interoperability — connects to major SIP trunking providers, IP PBX, and UCaaS platforms

Technical Specifications