the phone NEEEDS to see the 46xxsettings.txt. And if your IPO has a SELF-Generated 46xxsettings.txt file, the J-Series will come up.
First you must look at docs on setting up SIP domain, and necessary parameters for SIP sets...
Next
If you look in the IPO, and see if there is a file 46xxsettings.txt, delete it (UNLESS you are somehow customizing the file, then see the next paragraph). This will cause IPO to create a Self-Generated file. the info in the self generated file will be enough to upgrade the sets and register them to the IPO.
NOW, if you have customized the 46xxsettigns file, then you will need to know what was modified, so copy the file before deleting it. once deleted and you have teh self-generated file, then add to that, your customized settings...
Then you just need to put the file server into the J-series phone, and the settings file will handle the rest.