AudioCodes Mediant 500L Enterprise SBC – Compact 1U Session Border Controller, Up to 250 Sessions (M500L-ESBC)

The AudioCodes Mediant 500L (M500L-ESBC) is a compact 1U Enterprise Session Border Controller designed for branch offices, SMBs, and distributed enterprise deployments. Supporting up to 250 SIP sessions at maximum licensed capacity, it provides SIP security, protocol normalization, topology hiding, and media transcoding in a small, cost-efficient form factor. It supports Microsoft Teams Direct Routing certification, making it a natural fit for organizations connecting branch phone systems to Microsoft 365 voice services.

The Telecom Spot Take

The Mediant 500L fills the gap between entry-level SBCs and the larger Mediant 800B and 2600 platforms. Its compact 1U chassis keeps rack space consumption minimal — important for branch office IDF closets and SMB server rooms with limited rack space. At up to 250 licensable SIP sessions, it handles concurrent call loads that exceed what most branch offices or medium-sized businesses generate. For organizations standardizing on Microsoft Teams or deploying SIP trunking across multiple branch sites, the Mediant 500L provides a dedicated, purpose-built SBC without the footprint or cost of a data-center-class platform. Session capacity is license-based, so start with what you need and scale up without hardware changes.

Key Features

• Up to 250 SIP sessions — maximum licensed capacity covers branch office and SMB call volumes
• Compact 1U form factor — fits tight branch IDF closets and SMB server rooms
• Microsoft Teams Direct Routing certified — purpose-built SBC for connecting Teams Phone to PSTN
• SIP security and normalization — topology hiding, TLS/SRTP, DoS protection, and protocol repair
• License-based session scaling — start at a lower session count and scale to 250 without hardware changes
• Media transcoding — handles codec conversion between SIP carriers and UC platforms

Technical Specifications