an user line is named Extension
i see none of your users have a extension.
to create extensions, you must have a context.
go to “avanced” / “contexts”
you should have a context.
Select it, and edit it
in the user tab, add a range for yours internals phone numbers
eg;
then go to “user Managemen” / “users”
edit your user to add him a line, eg:
now, the user is callable with the extension 1008 in my example.
cheers !