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.