International Telecommunications Union - (ITU) – A charter organization of the United Nations (Geneva, Switzerland).  ITU is a formal worldwide body that defines standards for telegraphic (including television) and telephone equipment. Parent organization for ITU-T (formerly CCITT) and ITU-R (formerly CCIR). http://en.wikipedia.org/wiki/ITU
www.itu.int/home

International Telephony Union - (ITU) - An international association of the telecommunications industry for the development of international standards and accords. www.itu.int

ITU-TSS - (International Telecommunications Union-Telecommunications Standardization Section) - International standards organization charged with setting standards for telecommunications. Also denoted as ITU-T. See CCITT.   www.itu.ch