D-Link DI-604 - Manual (Page 75)

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Contacting Technical Support
You can find the most recent software and user documentation on the
D-Link website.
D-Link provides free technical support for customers within the United
States for the duration of the warranty period on this product.
U.S. customers can contact D-Link technical support through our web site,
or by phone.
D-Link Technical Support over the Telephone:
(877) 453-5465
24 hours a day, seven days a week.
D-Link Technical Support over the Internet:
http://support.dlink.com
When contacting technical support, please provide the following
information:
Serial number of the unit
Model number or product name
Software type and version number