Calling someone from the OSX terminal

facetime.applescript

#!/usr/bin/env osascript
-- usage: facetime johndoe@xyz.com
on run {contact}
  do shell script "open facetime://" & contact
  tell application "System Events"
    repeat while not (button "Call" of window 1 of application process "FaceTime" exists)
      delay 1
    end repeat
    click button "Call" of window 1 of application process "FaceTime"
  end tell
end run