I followed a link to the Linux Call Rout ... / 2011-02-15

I followed a link to the Linux Call Router and found this gem on the page: www.blueboxing.org which has some good descriptions of blueboxing as it was 'back then' from the European view. And the Linux call router offers the option of CCITT-5 handling. You can also download Beep-Beep on the site which is a nice software bluebox (CCITT-5 dialer) for Linux. One advantage over CAESAR which I tried before in 2008 is that it can set a sequence of multiple digits and play it at once. Which has at least one advantage: the result sounds a lot like I expect from 'phreaking' sounds. And Jolly Eversberg runs a CCITT #5 exchange which you can phreak. Indeed, "Phreaking never dies!".