ITU
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
ITU Reccomendations
Free Downloads of ITU Reccomendations
Although the ITU charges for copies of its Reccomendations, you can download up to 3 per year of selected Reccomendations for free. Go here and select:- I wish to REGISTER in order to download up to three (3) ITU Recommendations free of charge
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