Internet Low Bit-Rate CODEC (iLBC)

The Internet Low Bit-Rate CODEC (iLBC) is a free speech codec originally developed by Global IP Sound and published in RFCs by the IETF.

The codec is a narrow-band speech codec operating from 13.33 and 15.2 Kbps and operating with an 8000Hz clock. The codec allows for two different frame sizes: 20ms and 30ms. Both are required by all implementations.

The specification for the codec can be found in IETF RFC 3951. The RTP packetization specification is RFC 3952.

Resources: iLBC Information Site, VoIP Bandwidth Calculator

See Also: CODEC