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G.727 is an International Telecommunications Union for Telecommunications (ITU-T) standard for speech compression and decompression used in digital transmission systems. It is a specialized version of ITU-T G.276 protocol intended for packet based systems using packetized voice protocol. G.727 uses 2, 3, 4, 5 bit per sample embedded adaptive differential pulse code modulation.
G.727 is an ITU-T standard for speech codec introduced at the same time as G.726 and includes thesame bit rates except that it is optimized for the packet circuit multiplex equipment environment. The entire objective is achieved by embedding 2-bit quantizer to 3-bit quantizer, and the same for the higher modes. This permits the dropping of the least significant bit from the bit stream without any adverse effect on speech signals.
The speech codec uses the adaptive digital pulse code modulation (ADPCM) method to compress 64 Kbps PCM into 40, 32, 24 or 26 Kbps to accommodate available network. It’s considered to be a specialized version of G.726 and ADPCM.