Abarceo
Glad to know that you've got into the configuration part of your 585 (v6) modem.
Now, as I explained before, I don't think that direct connection is possible with any Thomson SpeedTouch modem except the ST330 but, as far as I understand, you can't use an Internet phone with that model.
However, I have been talking to a work colleague that has a friend that regularly communicates with China via an Internet phone. She gets in touch with her friends and relatives via Skype, and I think that will be the answer you are looking for. Here is the URL for Skype, you should be able to find all the answers you want:
Try calling landlines or mobiles with SkypeOut, for free
As for any other configuration problems you may have, let me know and I will send you a screen print of my configuration page.
UK Bob