Yep, there are some issues with how the list is retrieved on Debian, yet I haven鈥檛 found the time to investigate it.
Here you can find the relative code: ns8-nethvoice/imageroot/actions/get-defaults/10defaults at main 路 nethesis/ns8-nethvoice 路 GitHub
In the meantime, if you find out how to fix it, a PR is very welcome 