iLBC Freeware

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Global IP Solutions, the creator of iLBC, was acquired by Google in January 2011. Google continues to support the iLBC effort and is offering it as part of it’s WebRTC open source effort. iLBC is now available under the same license as the WebRTC project. On this page, you will find material taken from the old page.

Below, you will find legacy information copied from for archival and reference purposes.

Additional iLBC documentation

What is iLBC?

iLBC (internet Low Bitrate Codec) is a FREE speech codec suitable for robust voice communication over IP. The codec is designed for narrow band speech and results in a payload bit rate of 13.33 kbit/s with an encoding frame length of 30 ms and 15.20 kbps with an encoding length of 20 ms. The iLBC codec enables graceful speech quality degradation in the case of lost frames, which occurs in connection with lost or delayed IP packets.


  • Bitrate 13.33 kbps (399 bits, packetized in 50 bytes) for the frame size of 30 ms and 15.2 kbps (303 bits, packetized in 38 bytes) for the frame size of 20 ms

  • Basic quality higher then G.729A, high robustness to packet loss

  • Computational complexity in a range of G.729A

  • Google is not charging royalties for iLBC


Please read on how you can get the source code and contribute to the code by reading the build information.