A new firwmare for this model was released, maybe you can have a try.. http://www.tp-link.com/en/support/download/?model=TD-VG3631&version=V1#tbl_j

maybe a limitation... but i have a little confused,, the phone number is used for VOIP call. when other people want to call you ,,they just need to press down "xx" , then a call will come to your...

1. what's the bandwidth which provided by your ISP? also what's download speed? maybe the hign speed downloading used up the resource of the modem ??? i can't sure 2....

RedKing wrote there's not log event about VOIP :( it's impossible, the device will register to the VOIP server every some minutes, so i think you can see it from the log.. also if it can't register,...

RedKing wrote when you login (no problem tologin) VOIP status is Down and ADSL is working perfectly! that's fine! if you can login on it , you can check the system log of the modem, then maybe you...

what's the sync speed? you can find it from device info->Statistics->xDSL