> For the complete documentation index, see [llms.txt](https://support.portsip.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x.md).

# High Availability (v16.x)

This guide is for setting up the PortSIP PBX v16.x high availability on Ubuntu 20.04.