You might want to talk to LoudVoiceSystems. They offer toll free numbers and if you call them, they can also set you up with a local United States phone number.
I have a toll free number set up with them (that is also a fax number). I did set up a local fax number as well and it will be sent to you as a PDF or TIF format. The local number though can be used as a virtual office if you would like of just a fax number.
What that means is, when someone dials a number, they can be asked to enter an extension - one for sales, two for support etc. And then it will dial any number that you need. You can compare their features if you would like. We are using the Extreme plan so we can have access to the WebLink. We usually refer one client over every over month so we end up getting a free month but we do pay for usage. So i any of your clients might be interested, you might think about doing that. They have a reseller plan which I am still debating over though. It would have saved me money (around $60.00) since I have been with them for a long time.
They might also require a deposit for Norway. The company is Freedom Voice. You can also get a number from Freedom Voice themselves but you basically end up spending $5.00 on set-up fees because they rely on resellers to help sell their plans.