This router can be used to set site-to-site VPN, but it cannot be a VPN sever. To connect a windows 7 computer to it through VPN, you have to use another router and configure VPN with TD-W8970.

Give a try to reduce the MTU size on the router, if yours now is 1500, you may change it to 1480 or 1440.

Yes, it supports that.

What I can think about is we need to make sure the internet is working properly while using the VOIP service. It is so complicated to check the settings, I suggest you guys to connect the Technical...

By the way, the adapters that belongs to the same Homeplug Standard will be able to find each other, for example, TL-PA211, TL-PA251 and TL-WPA281 are compatible, but all of them may not be able to...

From the picture you drew, the connection is fine, the powerline adapters will be able to connect with each other in order to expand the network. however, you need to make sure there is a router...