Caller ID Devices

Electronics Infoline Web

DTMF Generator/Decoder

http://www.boondog.com//tutorials/dtmf/dtmf.htm

http://www.ee.washington.edu/conselec/A95/projects/jjblome/links.htm

http://www.ee.washington.edu/conselec/A95/projects/jjblome/callerid.htm

http://www.ainslie.org.uk/callerid.htm

based on 68HC11

http://matthieu.benoit.free.fr/cidfr.htm

http://www.ainslie.org.uk/callerid/cli_faq.htm

based on Basic Stamp microcontroller, it hears touchtones and displays them as telephone numbers.

http://www.bobblick.com/techref/projects/tonedec/tonedec.html

http://www.ficora.fi/suomi/tele/gfi/gfi9702.htm