ISO/IEC 21407:2001 Preview
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Specification, functional model and information flows -- Simple dialog supplementary service
This standard was last reviewed and confirmed in 2006. Therefore this version remains current.
The electronic version of this International Standard can be downloaded from the ISO/IEC Information Technology Task Force (ITTF) web site
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A standard is reviewed every 5 years
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