> For the complete documentation index, see [llms.txt](https://gsm.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://gsm.learn-telecom.com/messages-for-mobility-management/intro.md).

# Intro

<https://www.etsi.org/deliver/etsi_gts/04/0408/05.00.00_60/gsmts_0408v050000p.pdf>

![](/files/U2tS6g8x1ErRZpq1iJ7n)

To learn more about the GSM technical specifications, you can refer to the ETSI document linked [here](https://www.etsi.org/deliver/etsi_gts/04/0408/05.00.00_60/gsmts_0408v050000p.pdf).