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Ha ha ha, that’s funny.
I guess the only reason for why you’d want to hookup an old rotary phone to a Raspberry Pi is because you can!
This is awesome! I just hooked up a rotary phone to our VoIP line at Workshop 88, and my next project is to get it to dial out.
I documented the process here: http://blog.workshop88.com/new-well-old-workshop-phone/
Any suggestions about how to inject the DTMF tones to get it to dial out?