# Page Not Found

The URL `faq/is-the-portsip-pbx-built-on-asterisk-freeswitch` does not exist.

You might be looking for one of these pages:
- [Is the PortSIP PBX built on Asterisk, FreeSwitch?](https://support.portsip.com/portsip-communications-solution/faq/is-the-portsip-pbx-built-on-asterisk-freeswitch.md)
- [PortSIP PBX v12.x is EOL](https://support.portsip.com/pbx_v12/portsip-pbx-high-availability.md)
- [High Availability](https://support.portsip.com/pbx_v12/portsip-uc-high-availability.md)
- [2 PortSIP PBX Management](https://support.portsip.com/portsip-communications-solution/portsip-pbx-administration-guide/2-portsip-pbx-management.md)
- [PortSIP ONE for Microsoft Teams](https://support.portsip.com/apps-guides/portsip-one-for-microsoft-teams.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://support.portsip.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://support.portsip.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/portsip-communications-solution/faq/is-the-portsip-pbx-built-on-asterisk-freeswitch.md`)
- Use `Accept: text/markdown` header for content negotiation