Why not try the DMZ?

Disabling SIP in telnet is the only way I know.

what do you mean by the client on the other side of the VPN? Client refers to the "client" set up on the computer or another VPN router? If you don't have a VPN router on the other side, please set...

Why not ask some friends who know Chinese for some help? As far as I know, the router bought in China is only saled in their country and they may not have the English instructions or software.

Uh, it seems that they are not quite compatible. Why not try the bin file for your modem on tp-link website?

Are u running the latest firmware? If not, upgrade the router first.