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.

Install the package.