Originally developed for videophones that deliver video and speech over regular phone lines (PSTN), G.723.1 is a dual-rate speech codec designed for the ITU-T H.323 and H.324 audio and videoconferencing/telephony standards.
G.723.1 specifies how the audio portion of the conference is to be coded. It can perform full duplex compression and decompression functions for videoconferencing products.
