--- phone.ca.inc.bak	2007-11-21 15:22:21.000000000 -0900
+++ phone.ca.inc	2007-11-21 15:31:34.000000000 -0900
@@ -58,6 +58,10 @@ function format_ca_phone_number($phonenu
   
   // construct ten-digit phone number
   $phonenumber = $matches[1] . '-' . $matches[2] . '-' . $matches[3];
+
+  if (!empty($matches[4])) {
+        $phonenumber .= ' x' . $matches[4];
+  }
   
   if ($matches[1] != "1") {
   	$phonenumber = "1" . " " . $phonenumber;