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