diff --git a/includes/defaults.inc.php b/includes/defaults.inc.php
index f1e56c551..a2fb5a663 100644
--- a/includes/defaults.inc.php
+++ b/includes/defaults.inc.php
@@ -235,13 +235,14 @@ $config['bad_if'][] = "span rp";
 $config['bad_if'][] = "span sp";
 $config['bad_if'][] = "sslvpn";
 $config['bad_if'][] = "pppoe-";
-$config['bad_if'][] = "voiceencap";
-$config['bad_if'][] = "voicefxo";
-$config['bad_if'][] = "voicefxs";
-$config['bad_if'][] = "voiceoveratm";
-$config['bad_if'][] = "voiceoverframerelay";
 #$config['bad_if'][] = "control plane";  ## Example for cisco control plane
 
+$config['bad_iftype'][] = "voiceencap";
+$config['bad_iftype'][] = "voicefxo";
+$config['bad_iftype'][] = "voicefxs";
+$config['bad_iftype'][] = "voiceoveratm";
+$config['bad_iftype'][] = "voiceoverframerelay";
+
 $config['bad_if_regexp'][] = "/serial[0-9]:/";
 $config['bad_if_regexp'][] = "/^ng[0-9]+$/";
 $config['bad_if_regexp'][] = "/^sl[0-9]/";
diff --git a/includes/functions.php b/includes/functions.php
index f6dc898e8..42bc637ff 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -611,6 +611,17 @@ function is_port_valid($port, $device)
         }
       }
     }
+    if (is_array($config['bad_iftype']))
+    {
+      foreach ($config['bad_iftype'] as $bi)
+      {
+      if (strstr($port['ifType'], $bi))
+        {
+          $valid = 0;
+          if ($debug) { echo("ignored ifType : ".$port['ifType']." (matched: ".$bi." )"); }
+        }
+      }
+    }
     if (empty($port['ifDescr'])) { $valid = 0; }
     if ($device['os'] == "catos" && strstr($if, "vlan")) { $valid = 0; }
   } else {