property lb_prefix : "tel:"

on handle_string(s)
  -- Trim the LaunchBar prefix if it exists.
  if s starts with lb_prefix then set s to ¬
    (text ((count lb_prefix) + 1) thru -1 of s)
  
  -- Strip non-numeric characters.
  set numeric to ""
  repeat with i from 1 to the number of characters in s
    if character i of s is in {"+", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"} then set numeric to numeric & character i of s
  end repeat
  set s to "+1" & numeric
  
  -- Service 1 is always AIM apparently.
  tell application "iChat"
    send "" to buddy s of service 1
    activate
  end tell
end handle_string