Grandstream Networks WP810 Administration Manual page 58

A configuration parameter is associated with each field in the web configuration page. A parameter consists
of a Capital letter P and 1 to 5 (could be extended to more in the future) digit numeric numbers. i.e. For a
detailed parameter list, please refer to the corresponding firmware release configuration template in the
http://www.grandstream.com/support/tools
following link:
When the WP810 boots up, it will issue TFTP or HTTP(S) request to download a configuration XML file
named "cfgxxxxxxxxxxxx" followed by "cfgxxxxxxxxxxxx.xml", where "xxxxxxxxxxxx" is the MAC address of
the phone, i.e., "cfg000b820102ab" and "cfg000b820102ab.xml". If downloading "cfgxxxxxxxxxxxx.xml" file
is not successful, the provision program will download a generic cfg.xml file. The configuration file name
should be in lower case letters.
For more details on XML provisioning, please refer to the following document:
http://www.grandstream.com/sites/default/files/Resources/gs_provisioning_guide.pdf
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WP810 Administration Guide
Version 1.0.1.1