Grandstream Networks GXP1610 Administration Manual page 69

When GXP1610/GXP1615/GXP1620/GXP1625/GXP1628/GXP1630 boots up, it will send TFTP or
HTTP/HTTPS requests to download configuration files, "cfg000b82xxxxxx" and "cfg000b82xxxxxx.xml",
where "000b82xxxxxx" is the MAC address of the phone. If the download of "cfgxxxxxxxxxxxx.xml" is not
successful, phone will issue request for a generic configuration file "cfg.xml". Configuration file name should
be in lower case letters.
For more details on XML provisioning, please refer to:
http://www.grandstream.com/sites/default/files/Resources/gs_provisioning_guide.pdf
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GXP16XX Administration Guide
Version 1.0.4.100