I've recently reset my Technicolor TG784n v3 and I've successfully set up my Internet. But for voip I can't seem to set it up, mainly because I keyed in the wrong password for voip.

I've seen some post before the password is <VOIP PHONE NUMBER><1> but it's not successful for me. keep showing status ticked but not registered.

My currently settings it set to
SIP and URI is : my VOIP phone number
Password and confirm password is : my VOIP phone number + 1
other all blank and port is set to all.

Is there any thing that is wrongly set up?

That settings might applies to older accounts. You might want to try the following setup if the above is not working. It's what I use for my VOIP :

SIP URI : VOIP phone number
Username : VOIP phone number
Password : VOIP Account number + Last 4 digit of VOIP number
Confirm password : VOIP Account number + Last 4 digit of VOIP number