TP Link Archer C20 - Switching off SIP ALG


Please note: this guide is for the Archer C20 hardware version 4,5 router.

This guide will walk you through switching off SIP ALG on your TP Link router.
SIP ALG is known to cause a number of issues with Cool Ideas VoIP and switching it off is always recommended.

  1. Open your web browser and navigate to or

  2. You will be greeted by the page below:

  3. Enter the following and Log in:

    Username: admin
    Password: admin or coolideas1

  4. The following status page will appear once you have logged in.

  5. Navigate to Security > Basic Security on the left-hand menu.
  6. Select Disable in line with with SIP ALG.
  7. Click on Save.

Your router now has SIP ALG disabled.

If you have any trouble with the above, please don't hesitate to contact our support team on 010-593-2665 or via mail

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