| http://www.historyofphonephreaking.org | - an excellent reviel of bluboxing history with many documents |
| http://www.projectmf.org | - a similar project, where Asterisk PBX understands bluebox's tones, includes bluebox hardware plans |
| http://en.wikipedia.org/wiki/Signaling_System_No._5 | - CCITT #5 at Wikipedia, includes download link to the specification |
| http://www.webcrunchers.com | - Cap'n Crunch, one father of blueboxing tells us his story |
| http://video.google.de | - a nice documentation by discovery channel |
| http://www.linux-call-router.de | - the software that supports Signalling System No. 5 |
| http://www.eversberg.eu |
- just in case, if you like to know more about me: my homepage - and the impressum |