G.711 is a codec commonly used in IP telephony. G.711 was developed by the International Telecommunications Union and comes in two varieties, namely, U-law and A-law. The A-law variety is used in most countries other than Japan and the United States. G.711 a-law is used by the Nexbridge network.
With G.711, no compression takes place during the transmission of voice data – the codec only converts the analogue signal to a digital signal. The main downside to using this codec is that it takes up a lot of bandwidth due to the lack of compression. G.711 is supported by the vast majority of VoIP providers.