Please go to the extra tab and click on the custom link, in the Custom Settings section.
To open “Extra” tab, change the URL on the web browser to point to <IP address of Mushroom unit> and add ‘extra.html’, usually 192.168.254.99/extra.html.
And set the “Disable SIP Conntrack*” to True.
Once you click on ‘Apply’, please go to the ADMIN tab and reboot the unit.