WC6515 - how to disable incoming faxes?

Hi,

I'm trying to disable the incoming faxes on my WC6515DN: I see "Line Settings" in the web interface (currently set to "Incoming & Outgoing faxes") but I can't change it: it remains greyed out, even as admin, see image. The User Guide says I should be able to do it from the Embedded Web Server (p169) as well as from the Control Panel (p170).


software Current Version: 65.10.41


Any idea?

Pierre