You can use the printer over standard analogue telephone lines (PSTN = Public Switched Telephone Network) and PBX (Private Branch Exchange) telephone systems.
You may not be able to use the printer with the following phone lines or systems.
VoIP phone line such as DSL or fiber-optic digital service
Digital phone line (ISDN)
Some PBX telephone systems
When adapters such as terminal adapters, VoIP adapters, splitters, or DSL router are connected between the telephone wall jack and the printer