 G.719 is based on modified discrete cosine transform (MDCT) coding.It incorporates elements of Polycom's Siren22 codec (22 kHz) and Ericsson codec technology, as well as Polycom's Siren7 and Siren14 codecs (G.722.1 and G.722.1 Annex C), which have been used in videoconferencing systems for many years.As ITU-T Recommendation G.719, it was approved on June 13, 2008.