AudioCodes Mediant 1000B Pre-Configured VoIP Gateway – 2-Span T1/E1, Up to 46 Channels, 4 Expansion Bays (M1KB-D2)

Two T1/E1 spans pre-installed and ready to go. The AudioCodes Mediant 1000B M1KB-D2 ships with dual T1/E1 digital voice modules already configured in the chassis, providing up to 46 simultaneous voice channels on T1 (or 60 on E1) from the moment it's racked and connected. Four expansion bays remain open for additional T1/E1 modules, analog ports, or DSP cards as your deployment grows. This is the mid-entry point in the Mediant 1000B pre-configured lineup — enough capacity for a solid SIP trunking deployment today, with room to expand as call volume increases.

The Telecom Spot Take

Two T1 spans covers a lot of real-world call volumes: up to 46 simultaneous calls is sufficient for many mid-market organizations running SIP trunking, and it gives you headroom for peak call periods without requiring a third span from day one. The four remaining expansion bays mean this gateway can triple its T1 capacity simply by adding more M1KB-VM-1SPAN or M1KB-VM-2SPAN modules as traffic grows — no chassis swap, no re-provisioning from scratch. This is the value of the Mediant 1000B modular architecture: buy the capacity you need now, add incrementally as the business grows. The M1KB-D2 is also the gateway of choice for organizations replacing a legacy PBX with SIP trunking and needing enough concurrent channels to handle a full business phone system without a third T1 yet justified by actual call data.

Key Features

• 2 T1/E1 spans pre-installed: Up to 46 simultaneous channels (T1) or 60 channels (E1) — dual-span capacity from day one, no module installation required.
• 4 open expansion bays: Add more T1/E1 spans, BRI, analog (FXS/FXO), or DSP modules to grow capacity without replacing the chassis.
• 2 Gigabit Ethernet ports: Dual GE interfaces for SIP connectivity and optional network-level redundancy.
• SIP, H.323, and MGCP: Full multi-protocol gateway support for any enterprise VoIP or SIP trunking environment.
• E-SBC capable via software license: Same hardware can function as a Session Border Controller when licensed.
• T.38 fax relay: Fax over IP across all active T1/E1 channels.
• 1U rack-mountable: Standard 19-inch rack form factor with rear-panel cable management.
• Redundant PSU option: Add M1KB-PS-AC for active/standby power redundancy, or step up to M1KB-D2-2AC for factory-configured dual power.

Technical Specifications