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Inband signalling was the way long distance trunk lines worked back in the MF signalling days decades before ISDN D channels and SS7 and all that.

A fun topic to google for is what and how the 2600 Hz signal worked.




Didnt some guy figure out how to get free phone calls using a cheap whistle from a cereal box :-)


The book "Exploding The Phone" goes into all of these stories and much more. If you ever wanted to know about how and why the analog phone system was so hackable/phreakable, this book is for you.

[0] http://explodingthephone.com/


Wow, don't know how I missed that book. Looks great!


Captain Crunch!


John Draper

https://en.m.wikipedia.org/wiki/John_Draper


Yes, that's the most famous application. As to why it worked...that's the more interesting story IMHO.


And Wozniak had his blue boxes




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