There are a number of things that can be wrong. First can anybody call your Voxalot account without problems when registered to your Nokia? If not, then perhaps you need STUN server settings in your phone.
The other thing to do is test the dial plan, you should be able to get the right result if everything is setup properly without having to make the call.
You should see something like this:
A call to:nnnnnnnn will get forwarded to sip:nnnnnn@eu.voxalot.com
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