I don't think it was that important for the tip/ring to be exact, I've wired it both ways (with a vg248 mind you) and things work fine. Basically, you want the two wires (green/red) to be terminated on the Bogen t/r posts. You can do this any number of ways, by plugging in a line cord stripping one end and connecting to the post. You could could also get a full line cord plug one into the ATA another into a wall mount jack and then punch down from the jack into the Bogen.
Here's a graphic that might help:
http://www.tawsystems.com/diagram%20-%20jackwire2.jpg
Let us know if you need anything else.
Lelio
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