[Asterisk-Users] Aastra 9133i Configurations - are the file names to be lower case or upper case or does it matter?

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According to the wiki page
http://www.voip-info.org/tiki-index.php?page=Aastra+480i+Configuration it
shows lowercase file name and then there is a comment at the bottom that it
needs to be capitalized.

I have tried it both ways with no luck.  Could someone comment on which way
the cfg files need to be in the /tftpboot directory?

Thanks in advance.