VoIP App using Sailfin - hardware

I'm looking at developing a VoIP application running on Sailfin (https://sailfin.dev.java.net/).
I have the server up and running and a sample app installed. What I want to be able to do is:
Receive calls from my landline in my VoIP application.
Make calls from the application to other numbers in the PSTN.
The part I'm not sure about is what hardware do I need between the landline jack and my dev box?
Thanks!

You need to look at Asterisk and hardware used to support it.

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