I have a ZyXel 660HW modem/router...I just want to check that I have everything right.

Mode Routing 
Encapsulation PPPoA
Multiplex VC 
Virtual Circuit ID
 VPI 0
 VCI 100

User Name xxxxxxxxxx
Password xxxxxxxxxx
IP Address
   Obtain an IP Address Automatically
   Static IP Address
   Nailed-Up Connection
Network Address Translation
    SUA Only

I only have One computer connected..Also I have a a Linksys spa 2102 linked in for VFX
I have set the media bandwidth mgnt to voip and set it to high.
The ADSL seems to drop off quite a bit during peak times..It will go off for a few seconds then come back on.