Telephone and Intercom projects

Electronics Infoline Web

Isolated Telephone Interface

http://www.solorb.com/elect/phone/tap/

http://www.electronic-circuits-diagrams.com/telephonesimages/telephonesckt13.shtml

it will record any conversation on any phone on same line.

http://www.aaroncake.net/circuits/phonetap.htm

revents other telephones from hearing your call and disturbing your modem connection.

http://www.hut.fi/Misc/Electronics/circuits/tele_privacy.html

The alltel project strives to provide a simple computer telephony interface to applications. It does such things as off-hook

http://www.cm.nu/~shane/alltel/

http://www.aaroncake.net/circuits/phonhold.htm

http://www.ee.washington.edu/conselec/CE/sp95reports/du/title.htm

(dutch)

http://margo.student.utwente.nl/el/phone/008trick.zip