Disable SIP ALG on DrayTek Vigor Routers

Have a Question?

Ask below or enter your search terms

Live Status -

Please see our news section regarding remote working for COVID-19 requests

Disable SIP ALG on DrayTek Vigor Routers

Disable SIP ALG on DrayTek Vigor Routers

If you wish to use our IP products you will need to ensure SIP ALG has been disabled on your router. This is a guide will provide information on how to disable ALG on the most common DrayTek routers.

This includes:

Draytek Vigor 2830

Draytek Vigor 2830n

Draytek Vigor 2830Vn

Draytek Vigor 2830n Plus

Draytek Vigor 2820

Draytek Vigor 2820n


If the router has been provided by Eclipse we may be able to change this setting for you remotely, please contact our customer support team to see if this is possible.


  1. Open Telnet

  2. Type “open” and press enter. If this does not work it means the routers IP address has been changed from the default. They will need to speak to their IP support to gain access.

  3. Enter the username and the password for the router.

The default username and password for a Draytek is:

Username: admin

Password: admin

If this password has been changed the customer will need to find out the new password or speak to their IT support to gain access

  1. Type “sys sip_alg ?”

This command will tell you the current status of ALG.


  1. To disable SIP ALG type “sys sip_alg 0”

  2. Type “sys commit”

  3. Type “sys reboot”

Support Twitter Feed