The International Telecommunication Union (ITU) is a specialized agency of the United Nations that plays a central role in the world of telecommunications. A specific permanent organ of this organization, the ITU Telecommunication Standardization Sector (ITU-T), is responsible for a critical task: studying technical questions and issuing “Recommendations.”

Think of these recommendations as the official rulebooks for technology. By creating and publishing these standards, the ITU-T ensures that telecommunication systems and services are compatible and can operate together on a worldwide basis. This essential work prevents technological chaos and allows different systems from different manufacturers to connect and communicate flawlessly.

Now that we know who makes the rules, let’s look at a key rulebook for digital voice: the G.729 Recommendation.