Yup, it's just a case of renaming all the FXO files to RB4 and then putting them in the RB4 folder.
I've done it for you though already: http://www.mediafire.com/?1jrl1jnzmyt
Just put these into the "User Files" directory of CSR.
I've done it for you though already: http://www.mediafire.com/?1jrl1jnzmyt
Just put these into the "User Files" directory of CSR.