What Does G.7xx Mean?
G.7xx refers to a suite of the International Telecommunications Union for Telecommunications (ITU-T) standard for audio compression and decompression. They are used in digital transmission systems and for coding analog signals into digital. This family of standards is included in the G series ITU recommendations.
The specifications in G.7xx family include G.711, G.721, G.722, G.723, G.26, G.728, G.729, etc.