Archive URL:
http://web.archive.org/web/20070720063216/http://www.muehlen.com/projects/voip/voip_dial.user.js
this one has modified URLs in it.
Adjust the URL by adding id_ after the timestamp:
http://web.archive.org/web/20070720063216id_/http://www.muehlen.com/projects/voip/voip_dial.user.js