Siemens gigaset SE551 Owner's Manual page 145

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If you wish to install a printer for this port immediately, click on Next and follow the
printer installation wizard's instructions.
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If you do not wish to install a printer until later, click on Cancel.
Note:
The Gigaset SE551 WLAN dsl/cable's printer server does not work bidirectionally. It
does not evaluate any of the printer's response messages. For this reason please make
sure that your printer is also configured unidirectionally. You can make the relevant
printer settings for your printer via Start – Settings – Printer.
Installing the printer port for network printers
143