found what i need to recycle

app/extensions/extension_edit.php

@@ -136,6 +136,8 @@
 			$enabled = $_POST["enabled"];
 			$description = $_POST["description"];
 
+			//Yea i think i will have to recycle some code from here to get automatic extension assignment working
+
 			//outbound caller id number - only allow numeric and +
 			if (strlen($outbound_caller_id_number) > 0) {
 				$outbound_caller_id_number = preg_replace('#[^\+0-9]#', '', $outbound_caller_id_number);