I'm having trouble converting my 7960G from SCCP to SIP. It keeps showing a file auth error on the P0S3-07-05.sbn file. How do I work around this error?

I am having an issue with incoming calls not being able to get through. I have checked with my SIP provider, and the device is registered. The device isn't answering the incoming call invitations, and a '404 Not Found' error is being sent back. Outgo...