> 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/system-information-messages/system-information-4-si4.md).

# System information-4 (SI4)

![](/files/CXXQruRXuppl9NDr874N)

![](/files/GbMK9pKPiwwOuyeYsA7B)