callto: tel

callto: tel, a Firefox Greasemonkey script, automatically identifies telephone numbers within hCard microformat contacts and creates callto: links to open calls in Voice-over-IP software such as Skype.

To use callto: tel:

  1. Install Firefox
  2. Install Greasemonkey
  3. Install the callto: tel Greasemonkey script
  4. Visit some sites with hCard contacts
  5. Make phone calls from the web!