peter wrote

that's fine! if you can login on it , you can check the system log of the modem, then maybe you can know what's the cause.

there's not log event about VOIP :(

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, you can see it also .

Dear Peter,

here what we can see:

Index Time Type Level Content
1 2013-03-13 11:51:31 OTHER Debug sip 0 register succeed, rtt 0
2 2013-03-13 11:51:31 OTHER Debug port -1 cx 0x0, evt/reason 5/19 buf (nil)
3 2013-03-13 11:51:31 OTHER Debug account[0350950959(0)] registration ok
4 2013-03-13 11:46:36 OTHER Debug sip 0 register succeed, rtt 0
5 2013-03-13 11:46:36 OTHER Debug port -1 cx 0x0, evt/reason 5/19 buf (nil)
6 2013-03-13 11:46:36 OTHER Debug account[0350950959(0)] registration ok
7 2013-03-13 11:41:41 OTHER Debug sip 0 register succeed, rtt 0
8 2013-03-13 11:41:41 OTHER Debug port -1 cx 0x0, evt/reason 5/19 buf (nil)
9 2013-03-13 11:41:41 OTHER Debug account[0350950959(0)] registration ok
10 2013-03-13 11:36:46 OTHER Debug sip 0 register succeed, rtt 0
11 2013-03-13 11:36:46 OTHER Debug port -1 cx 0x0, evt/reason 5/19 buf (nil)
12 2013-03-13 11:36:46 OTHER Debug account[0350950959(0)] registration ok

But seems that if you make a call from outside you receive fast busy and you can't call outside or receive incoming call. On the voip pannel the registration says up.

Rgs
Max

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

Tried, but same problem on voip persist.
I give to the support a lot of log; now they are testing it with some our numbers
i believe in TP-Link Engineers

hope they can give out a perfect solution soon.. :D

I'm having the same problem, sometimes I can't call out, most of the time no-one can call in. If i log in to the router, it says sip is up. If i go into any voice related configuration page and then close the web interface everything works fine. A few hours later and it is messed up again.
I have checked all the settings with Faktortel and they are all correct.
The voip messes up faster if I have 2 VoiP lines and 2 phones connected.
Since having VoiP included in the modem/router rather than in the linksys ata was the whole point of buying this device, I feel like I've been ripped off big time...... Was this even tested before it went to market?
Yes I have the latest firmware and before the stupid questions start, I'm a computer tech and have no trouble manually configuring a modem/router/wifi/voip. I've never run into a problem like this one though.

new Firmware: http://www.tp-link.com/en/support/download/?model=TD-VG3631&version=V1#tbl_j ;)
IGMP Snooping is enabled by default.
Fix the problem that the default 8/35 bridge rule can't be added in the group.
Fix the problem that call-in-progress breaks off in EWAN mode.
Fix the problem that port 7547 can be accessed even though CWMP is disabled.
Fix the problem that the phone number can't be less than 2 characters.

Dear All,

with firmware TD-VG3631_V1_130413 now voip seems work with italian voip provider, we are under test but seems fine. No in&out call was lost. Great Job.

after upgrade (TD-VG3631_V1_130413) voip seems ok but UPnP doesn't works anymore :( ARGHHH