SOLVED: Its needed to add the bridge interface with proper VPI/VCI parameters and joining it with a LAN port where the dialer will be connected on the Interface Grouping tab.

Region : Mexico Model : TD-W8970 Hardware Version : Firmware Version : 0.6.0.2.8 Build 130828 ISP : TELMEX Hi, im writing this support request since i've trying many ways to configurate this TD-W8970...