> For the complete documentation index, see [llms.txt](https://ss7.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ss7.learn-telecom.com/history/standards.md).

# Standards

Narrowband - ITU-T Recommendation Q.702 

Broadband - ITU-T Recommendation Q.2140 and Q.2210  

Europe - ETSI EN 300 008-1  

USA - ANSI  

China - CHN  

Japan