HI
What exactly you are looking for? you mean you have 10 line from vox want want to forward all the incoming calls from these lines to a single account you already configured in your Trixbox or Elastix box?
http://www.yebolinx.com
I almost did, when I did my sums it worked out not so cost effective for me.But its all sip protocols so it shouldn't be a problem just to add them in.