Here is a helpful pic:

 

Hey onepoint, did you ever go ahead and go through with this? I found out that the plug is officially a RJ-50 plug being that it's a 10-pin connector. I was however unable to find any useable power. I spent probably about 20mins poking around with my multimeter and could never get any solid power from any of the leads.

Here's a good chart of the wiring on a regular RJ50.
http://en.wikipedia.org/wiki/RJ50