Maybe not.....
From Doug Anderson of Shoestring Astronomy....
".... are you absolutely certain it is wired pin 1 to pin 1 as outlined in this document:
http://www.store.shoestringastronomy...ort_cables.pdf
Most RJ12 cables in stores are wired pin 1 to pin 6 and thus will not work properly with the GPUSB. "
Will have a look.... why can't these things be simple?