VoIP Engine™ - Voice over IP Engine Suite  for Android™/ARM® /iOS® /Windows™ operating systems
VoIP Engine is at the core of our ARM-based VoIP applications, it provides complete PCM to packet processing.

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Voip Engine (tm)


Demonstration software for the VoIP Engine product currently available on either iPhone or Android platforms.

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VoIP Engine SW: Sound depth and clarity unprecedented in the mobile voice app market.

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VoIP Engine: Crystal clear voice and audio for mobile applications.

VoIP Engine is at the core of our ARM-based VoIP applications, it provides complete PCM to packet processing. The Adaptive Digital VoIP Engine software is a software engine package that handles all the voice processing from PCM to Packet and back. Its intended use is in VoIP enabled handsets or desktop phones. Although VoIP Engine is not tied to any particular software environment, it was designed with Android™ and iPhone™ in mind.

VoIP Engine the "One" Voice Solution™ for Mobile VoIP Development:

PCM Front End (Independently Accessible)

  1. HD Acoustic Echo Cancellation VoIP Engine
  2. Noise Reduction
  3. Tone Generation
  4. Gain Control
  5. Automatic Gain Control
  6. Diagnostics to assist in acoustic tuning
  7. Equalization

VoIP Handler

  1. G.711 with appendices 1 (packet loss concealment) and 2 (discontinuous transmission)
  2. G.729A Vocoder
  3. G.722 (wideband audio) with packet loss concealment
  4. G.722.2 Vocoder (Optional)
  5. AMR Vocoder (Optional)
  6. RTP/Jitter Buffer
  7. SRTP
  8. DTMF keypress tone relay transmit (IETF RFC2833)


The VoIP engine is purely a data processing engine. It has no interface to drivers or peripherals and performs processing solely at the request of the host application. The host application feeds the VoIP engine PCM samples from the audio input and and RTP packets from the network input. The VoIP engine in turn returns, via callbacks to the host application, PCM samples to be sent to the audio output device and RTP packets to be sent to the network interface.


ADT VoIP Engine is available on the following Platforms: Other configurations are available upon request.

Android Operating System
iOS4, and  iOS5 Operating Systems
Windows 7, and Windows Vista


VoIP Engine includes:

  1. Speech Compression
  2. Acoustic Echo Cancellation
  3. Voice Quality Enhancement
  4. Full Duplex Hands Free support
  5. Tone Handling
  6. Speaker Volume Control
  7. Test and diagnostic software to assist in acoustical tuning

Future enhancements will include:

  1. G.711 Appendix 2
  2. G.729AB (with Appendix B)
  3. Plug-in Codecs

Today’s mobile phone applications include an extraordinary amount of functionality. In the Android space in particular, writing software at the native layer is difficult not only due to the complexity of Android but also due to the anarchistic nature of open-source software in general. The best-case scenario for a developer is therefore to work at the Java layer. But for performance reasons, much functionality needs to run at the native layer.

To make mobile phone application development manageable, developers have many development kits at their fingertips to handle the native layer complexity. Adaptive Digital’s VoIP Engine brings the necessary VoIP function­ality to the native layer. All the developer needs to do is access the VoIP engine using a simple API, and package the supplied VoIP Engine native layer application with the end user Android application.

VoIP Engine is supplied with a sample Java application and a sample native application that in turn interfaces with the VoIP Engine software.

The sample Java application interfaces with the sample native application via Java Native Interface (JNI) to setup an RTP/IP to RTP/IP VoIP connection.

Android developers can incorporate the Java sample code into more complete VoIP-enabled Android applications.


Android Performance - Full Duplex, AEC Enabled, 20ms Frame Size

Codecs Millions of Instructions Per Second Noise Reduction - ON Noise Reduction - ON
G.711 MIPS 141 91
G.729 AB MIPS 170 115
G.722 MIPS 302 217


Software Architecture: The figure below depicts how the VoIP Engine fits into a VoIP enabled host application.

VoIP Engine data flow.

Additional Features:

  1. Adaptive Digital’s VoIP Engine provides all the voice processing necessary to VoIP-enable an mobile device application.
  2. Adaptive Digital provides customers with expertise in integration and development to enable differentiation of their next gen mobile application.

For VoIP Engine product information, please contact sales. Tel: 1-800-340-2066 x120 or email us.

Adaptive Digital (easy integration + field proven algorithms) = quick-to-market applications