> For the complete documentation index, see [llms.txt](https://docs.redlabs.cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.redlabs.cloud/2g-gsm/sgsn-serving-gprs-support-node.md).

# SGSN - Serving GPRS Support Node