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.