The International Telecommunications Union, in Geneva, Switzerland is an international organization within the United Nations System that issues ‘Recommendations’ for global telecom networks and services.
Examples:
E Series: Network Operations
H Series: Audiovisual and Multimedia systems – Includes H.323 – VOIP Protocol
I Series: Integrated Services Digital Network
Q Series: Switching and Signalling – includes SS7, ISDN PRI Signalling, Advanced calling services and others
X Series: Data Networks, Open Systems Communications and Security – includes X.25 – packet protocol for data networks — once very popular but now rapidly fading away in usage
Free Downloads of ITU Recommendations
Although the ITU charges for copies of its Recommendations, you can download up to 3 per year of selected Recommendations for free.
- I wish to REGISTER in order to download up to three (3) ITU Recommendations free of charge
April 7, 2023
Phone System 