For those who like to watch TV series 24, you must be familiar with the ringtone of those cool Cisco™ IP phones on every Counter Terrorist Unit (CTU) desk office. Apparently someone shared it somewhere in the internet and after I downloaded and used it for a while, I’d like to share it here.

Too bad I only have one version of the ringtone. Nevertheless, it sounds like a cool ringtone for your mobile handphone, don’t you think?