How to Disable SIP ALG on TP-Link xDSL modem router

For the VOIP application, sometimes the ISP will ask you to disable SIP ALG on your modem router. Please refer to the following steps to do the configuration.

Step 1 Refer to the link below to log in to the web management interface.

How to log into the web-based interface of the AC VDSL/ADSL Modem Router

Step 2 Go to Advanced > NAT Forwarding > ALG to turn off SIP ALG.