AudioCodes Mediant 1000B Pre-Configured VoIP Gateway – 4-Span T1/E1 Quad Module, 2 Expansion Bays (M1KB-D3)

Four T1/E1 spans. One 1U chassis. The AudioCodes Mediant 1000B M1KB-D3 ships with a quad T1/E1 voice module pre-installed, delivering up to 92 simultaneous voice channels on T1 (up to 120 on E1) — enough concurrent call capacity for a serious mid-market SIP trunking deployment. Two expansion bays remain available for additional voice modules, analog ports, or DSP resources. This is the Mediant 1000B pre-configuration that suits organizations replacing a legacy PBX with significant T1 capacity or running high-density SIP trunking without yet needing a fully populated chassis.

The Telecom Spot Take

The M1KB-D3's quad-span module occupies a single bay in the chassis, making it far more efficient than installing four separate single-span modules — you get 4x the T1 capacity in one bay footprint, leaving two bays completely free for analog modules, additional digital spans, or DSP processing cards. At 92 channels on T1, the M1KB-D3 handles call volumes that would require two or three smaller gateways to cover, consolidated into a single managed unit. Organizations running contact centers, financial services operations, or any environment with sustained concurrent call volumes above 30 will find this configuration well-matched to real-world peak traffic. The Mediant 1000B's multi-service architecture means the same chassis can serve as a gateway, SBC, or hybrid platform as the deployment evolves — just a software license change, not a hardware swap.

Key Features

• 4-span T1/E1 quad module pre-installed: Up to 92 simultaneous channels on T1 (120 on E1) — high-density capacity in a single voice module slot.
• 2 remaining expansion bays: Add analog (FXS/FXO), BRI, additional T1/E1, or DSP modules to further customize the gateway.
• 2 Gigabit Ethernet ports: Dual GE interfaces for SIP connectivity and optional network-level redundancy.
• Space-efficient quad module design: Four T1/E1 spans in one module bay means more room for other module types compared to four single-span modules.
• SIP, H.323, and MGCP: Full multi-protocol gateway support for any VoIP platform or SIP trunking provider.
• E-SBC capable via software license: Session Border Controller functionality available on the same hardware platform.
• T.38 fax relay: Fax over IP on all active T1/E1 channels.
• 1U rack-mountable: Standard 19-inch rack form factor with 192-channel maximum capacity when fully populated.
• Redundant PSU option: Add M1KB-PS-AC for active/standby power redundancy or step up to M1KB-D3-2AC for factory dual-PSU configuration.

Technical Specifications

Frequently Asked Questions

Why does the D3 use a quad module instead of 4 single-span modules?

The quad T1/E1 module delivers 4 spans in a single bay slot, leaving two bays free for other module types — analog ports, BRI, or DSP resources. Four separate single-span modules would fill 4 bays and leave only 2 bays free with less flexibility for mixed configurations. The quad module is also more cost-efficient than purchasing four individual span modules.

What is the maximum call capacity of the M1KB-D3?

With the pre-installed quad module, the M1KB-D3 supports up to 92 simultaneous channels on T1 or 120 on E1. Adding additional modules in the remaining 2 bays can increase total capacity up to 192 channels in a fully populated chassis.

Can I add power redundancy to the M1KB-D3?

Yes. The M1KB-D3 ships with a single AC power supply, but the chassis includes a second PSU bay. Adding an M1KB-PS-AC provides active/standby power redundancy. Alternatively, the M1KB-D3-2AC variant ships with both PSU bays populated from the factory.