Check out:
GX900 They have an awesome USA voice/pin solution and they are a Top Level Dialer Network.. No middle men... I know they can enable affiliate tracking and customized pages for your sites in a bunch of foriegn languages...
Example:
http://www.gxplugin.com/loader/index...e=su&c_code=us
Just by adding them you will make more $$$ off your existing traffic!
Best of all they will Fed-Ex your payments, so they are always on time!
Hope this helps!
B-