This guide was created using a Cisco EA6500 (Linksys AC1750) series router.
How to Disable SIP ALG
Log into the router and navigate to Connectivity -> Administration -> Application Layer Gateway
Uncheck the following to disable SIP ALG:
- Enable SIP ALG
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.