# Page Not Found

The URL `faq/which-ip-phones-work-with-portsip-pbx` does not exist.

You might be looking for one of these pages:
- [What are IP Phones Work with PortSIP PBX?](https://support.portsip.com/portsip-communications-solution/faq/what-are-ip-phones-work-with-portsip-pbx.md)
- [How do push notifications work with PortSIP PBX?](https://support.portsip.com/pbx_v12/push-notifications/how-do-push-notifications-work-with-portsip-pbx.md)
- [How Do Push Notifications Work with PortSIP PBX?](https://support.portsip.com/development-portsip/mobile-push-notifications/how-do-push-notifications-work-with-portsip-pbx.md)
- [WSI: Pub/Sub](https://support.portsip.com/development-portsip/going-real-time-with-portsip-pbx-pub-sub.md)
- [Going Real-Time with PortSIP PBX Pub/Sub](https://support.portsip.com/pbx_v12/tutorials/going-real-time-with-portsip-pbx-pub-sub.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/what-are-ip-phones-work-with-portsip-pbx.md`)
- Use `Accept: text/markdown` header for content negotiation