magic jack on win 7

#1
I have two magic jacks that I am putting in to one computer for a two line phone. right now I am running win xp but will be upgrading to win 7 soon. Befor I hook this up would like to know if anyone has done this befor. This is a work place I am doing this for and there not the main lines. I have business internet T1 cable line 1.5 up 1.5 down, Also how will this tax my bandwith. Any info would be great.
 


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