Home Telephone Systems How Do You Build Your Own Home Telephone Network?

How do you build your own home telephone network? - home telephone systems

I would like to create my own telephone system (intercom) in my house. I do not want only a 9-volt battery and 2 phones, I want a numbering system, where I can dial a number and a telephone ringing.

It is also possible to use a PC Card modem or fax board used to do?

Thanks, Tom