G.729.1 speech/audio codec was standardized by ITU-T in 2006. The codec operates on each 20ms frame of 16-bit speech/audio signals sampled at 8 KHz or 16 KHz and generates a compressed bit-stream having bit-rates in the range of 8 kbps  32 kbps structured as 12 layers. The layered approach allows the decoder or any other component in the communication system to truncate the bit-stream by removing the higher layers. The base layer, at 8 kbps, is inter-operable with the G.729 codec. The second layer, at 12 kbps, is the narrowband enhancement layer. Bandwidth extension is added in layer three and predictive transform coding based on MDCT improves the quality from layer four to twelve. The encoder has an inherent support for FEC for bit-rates greater than 12 kbps. The decoder supports the G.729B VAD/DTX scheme has an inherent packet loss concealment algorithm. The codec is primarily targeted for wideband VoIP applications.