By using an old laptop, a home made chat-cord and some parts from an old telephone you can build a telephone tapping device. Add Atropos to the mix and you have yourself an telephone call archiving system that will save all incoming and outgoing calls. Maybe not that legal if you actually use it, as it’s illegal to tap phones in most contries. It’ss probably even illegal to tap you own phone but a fun project non the less. Step by step instructions and and even a sample of an incoming phone call. Link. Might be good for podcasting.
HOW TO – Build a telephone archiver tapping device