Update registrations.php add a comment so we know why its there.

app/registrations/resources/classes/registrations.php

@@ -124,6 +124,7 @@ if (!class_exists('registrations')) {
 												$lan_ip);
 										}
                                         					elseif(1 === preg_match('/\ACL750A/', $agent)) {
+											//required for GIGASET Sculpture CL750A puts _ in it's lan ip account
 											$lan_ip = preg_replace('/_/', '.', $lan_ip);
                                         					}
 										$registrations[$id]['lan-ip'] = "<a href='http://".$lan_ip."' target='_blank'>".$lan_ip."</a>";