DIY Phone System: any Smartphone or PC (Softphone)

You can connect any smartphone to your sip system.

I would recommend the app: Linphone since it is open source.

Android/IOs

Now you need the Server IP, Extension Number and Password. If you don´t know them check out the parent article: https://technologiehub.at/project-posts/diy-phone-system-refurbish/

In the app select:

Next put in your information:

Now you should be able to call and be called within the app. The app must always run in the background to be able to receive calls.

Windows

Install the package.