Fax machines, in Whitehall, are the devices through which a document is sent over a telephone line. These possess some advantages over the Internet as the unencrypted data, is less vulnerable to interception in this mode of delivery.
Conventional fax machines have now-a-days been replaced by fax servers and other computerized systems that can receive and store incoming faxes electronically, and then route them to users on paper or via secured email. Such systems are cost-effective as these can eliminate unnecessary printouts and reduce the number of inbound analog phone lines needed in an office.
Fax machines utilize standard Public switched telephone network lines and telephone numbers in Whitehall.