You can route calls based on the phone number that is calling. In the Call Flow Editor, select the Caller Routing action.

Once selected you can specify which phone numbers you want to route by:

In the above example, the country code for Denmark, Sweden, and Norway (aka Scandinavia) have been entered. After specifying it, you can route based on whether it's a match or not:

If the caller does not have +45, +46, or +47 in the number or is calling from an unlisted number, the call goes to an IVR where one of the three queues can be chosen manually by the caller.