Assuming you're not going to upgrade to just DRS the info, you're looking at some time adjusting the BAT export you'll get from 5.X so it's compatible with 9.X.
There's no guide or explanation for that, you'll need to get some BAT files from 9.X to see what info is mandatory for phones and add all those new fields to the 5.X export.
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate