Im not sure coz I dont have HG655a.. but u may refer to my config to setup ur ONT..
1st u need to create the VoIP WAN with vlan 822, connection type: DHCP
[attachmentid=3305492]

Go to VoIP setup and setup as follow:
[attachmentid=3305496]

Finish.

You can check the status of the VoIP WAN and the SIP:
If successful, VoIP WAN will get "connected" and the ip as well.
[attachmentid=3305497]

VoIP Status need to get "registered" then you are good to go..
[attachmentid=3305508]

the voip led shoud lid up and plug in the tel line to the ONT

Anyone experience disconnect on Maxis Fiber VDSL ?

that only happen when i use custom setup. where

NETIS (VLAN ID 621, map to port 2 not tagged) --> Netgear r6300v2 (dial pppoe)

this setup works fine for months, until today it connect after reboot both device. then few minutes later it disconnect and it wont reconnect. i look into the syslog. it says received disconnect command from the ISP.

then when i change the setup back to original maxis one.
NETIS (VLAN ID 621, map to port 2 tagged) --> MAXIS TP Link Archer c5v

it works fine........
issue is, the stock router sucks. i would like to use my NETGEAR as primary dialer/router. and TM NETIS as bridge. but this setup seems not working.

i already send technical to maxis, wait them call back.

is your BTU Netis or Huawei one ?

for now i revert back using Maxis stock TP-link C5v first. plan to get router that support proper WAN VLAN tagging.

since my previous router [netgear 6300v2] the switch only support 2 digit vlan only. even change to merlin firmware [they have maxis profile option with proper WAN port VLAN tagging] or ddwrt which only show 16 VLAN only.

i think they do some remote upgrade to the BTU, or they check for specific packets with tags..... on PPPoE, i can confirm is they will send disconnect command to our modem if no VLAN tagging configured [port map method].

your router support wan vlan tagging ?