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+Zyxel Sip ALG
+##############
+
+
+This guide was created using V4.2/4.25 firmware on a ZyXEL USG60 series UTM router.
+
+ 
+
+How to Disable SIP ALG
+
+                Log into the router and navigate to Configuration -> Network -> ALG
+
+                Uncheck the following to disable SIP ALG:
+
+                                * Enable SIP ALG
+
+                                * Enable SIP Transformations
+
+                                * Enable Configure SIP Inactivity Timeout
+
+                                * Restrict Peer to Peer Signaling Connection
+
+                                * Restrict Peer to Peer Media Connection
+
+Click the Apply button at the bottom of the page.  A reboot should not be necessary, but if you’re still experiencing issues then it is a good idea to try rebooting the router and testing again.
+
+
+.. image:: ../_static/images/firewall/fusionpbx_zyxel_usg60.png
+        :scale: 85%