Epson EPL-N2550 Network Manual page 112

Instructions for using a dial-up network
This section explains about using a dial-up network.
Note:
The primary server described in this manual indicates a primary time
server which offers time to the workstations on the network.
Using a dial-up network in each mode
Print Server mode
You must use a dedicated dial-up line.
Since polling is performed on the file server in the print server
mode, no vicarious response by the router is possible. Therefore,
no dial-up connection is possible in this case.
Remote Printer mode
In Remote Printer mode, use of a router with a vicarious response
function allows the primary server to be installed at the dial-up
destination. However, an extra account might be generated when
the primary server is down. To avoid that, it is recommend to use
connections via a dedicated dial-up line.
Follow the instructions for using a dial-up line.
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How To