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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

• Royalty Free Codec

It is easy to contribute to the  iLBCfreeware.org project. All you need to do is find a part of iLBC that you think could be improved or extended and make those changes (carefully and cleanly) and submit that back to the Project, by contacting us via thisemail or throughIETF Audio Video Transport (avt) Working Group mailing listavt@ietf.org. This could be anything from documentation, added functionality (such as Voice Activation Detection), to improvements on the source code. 

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