By default the NIT automatically capitalises the first letter of your password when you enter it into the password dialogue box. It's only on screen for a brief moment before turning into an asterix that hides what you've typed.

This is OK if the first character of your password IS a capital letter, but not if it isn't. This is a very easy mistake to miss.

I know this caught me out a couple of times, until I read about it somewhere on this forum and corrected it.

Also my username and password (on Sipgate.co.uk) are not the same as I use to actually log into my account on the Sipgate website.

Username is the last 7 numbers of my Sipgate telephone number (i.e. #######@sipgate.co.uk) in the Internet call setup on the NIT.

And my password is one issued to me by Sipgate, not the one I defined when setting up the account on their website.

Don't know if it's the same with your SIP provider, but it doesn't hurt to check these things.