MSA Family

Reference designs, ready-to-use products or application examples for voice intercom

SIP Voice Intercom with Speech Processing

The MSA family of products and reference designs is composed of several SIP intercom units to face the need of crystal clear voice communications in industrial, residential, transporation, and many others, applications. MSA includes VoIP (SIP) intercom, external audio amplifiers, intercom for two wires analog phone lines, and much more. 

With a flexible companion GUI to set and control all the units in a system and the embedded proprietary audio and speech processing, including echo canceller and noise reduction, MSA products fit all the need in a clear voice communication application.

MSA family is composed by:

All the applications are customizable on requests.

A complete SIP intercom terminal in a small form size running on a single ARM Cortex M7 with a stunning audio quality


MSA is a full featured VoIP SIP intercom terminal, with several inputs and outputs. Based on a cheap ARM® Cortex® M7 processor, this product is compact, flexible, full-featured and with amazing audio quality, thanks to bdSound’s Speech Processing.

  • Based on ARM® Cortex® M7
  • Integrated RFC3261 compliant SIP client endpoint
  • Integrated audio amplifier and line out for external amplifier
  • Dual MEMS microphone on board or external microphone input
  • Powered via POE or DC input
  • Integrated speech and audio processing, including Full duplex wideband Acoustic Echo Canceller, Noise Reduction and Audio Procesing (EQ, filters, dynamic control, etc.)
  • Small size (55x55x21mm)
  • Support DTMF, Broadcasting, SIP Presence and registration to SIP server
  • Input, outputs, programmable relay and leds.

Download the MSA-SIP information sheet.

When more audio power is required, MSA-EA1 is the right accessory for MSA-SIP

MSA-EA1 External Amplifier

MSA-SIP include a stereo 3W/ch audio power amplifier. When more power is required, MSA-EA1 can be used. Easily pluggable on the top of MSA-SIP, MSA-EA1 delivers up to 10W of audio power to an external speaker.

  • External audio power amplifier pluggable with MSA-SIP
  • Same size of MSA-EA1
  • High Efficiency Class D Audio Power Amplifier
  • Short circuit protected
  • Industrial Grade components for harsh environment applications 
Intercom unit for analog phone two wires line, with embedded AEC and LEC


MSA-ANALOG is an analog intercom terminal that can work with analog standard two wires line. Typical applications include elevators, legacy intercom systems and industrial areas. MSA-ANALOG has integrated audio power amplifier and microphone amplifier, as well as two relays and other programmable I/O. The S2C embedded technology provides Acoustic and Line Echo Cancellation as well as Noise Reduction and other Speech Processing.

  • Based on ARM® Cortex® M7
  • Interface with analog two wires line
  • Manage on-hook, off-hook, busy-line
  • Integrated Speech Processing
  • Full-duplex AEC – Acoustic Echo Canceller
  • Full-duplex LEC – Line Echo Canceller
  • Adaptive Noise reduction engine
  • Integrated 3W/channel audio power amplifier
  • Integrated microphone amplifier
  • Two programmable relays
  • Up to 6 programmable GPIO
MSA reference designs are the fastest and most reliable way to design a voice SIP intercom unit

A true turn-key solution

MSA is provided as stand-alone product or as a reference design to reduce your product development time with a reliable and tangible solution. A complete offer including hardware design, firmware and software, GUI, integration and electroacoustic design support.

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