Yes, this feature is known as Calling Line Identification Restriction (CLIR). You can request for this ancillary service to be activated via the Customer Care or Technical Support Departments. Please Freephone 1902.
Can I use traditional FAX with Talk VoIP phone service?
Can I use traditional FAX with Talk VoIP phone service? No, unfortunately Digiweb cannot guarantee the successful operation of Fax over the Digiweb Broadband Talk (VoIP) service. However, general one page Faxes should be fine. Please note for UK DECT phones/fax machines, you need the UK cable and a proper UK/Irish adaptor with ringing capacitor built in. PLEASE READ: How to Send and receive faxes using Fritz!Box