I'd bet they physically are in Kazakhstan most of the time, even if they incorporated in California. They could have gone all the way and got an US phone number forwarded to them OTOH.

That's one thing SkypeIn is good for... I've had the same US number for many years now (with an area code in the same city as my mail-forwarder.. plus the number is a palindrome!), in spite of moving out of the country 5 years ago.

I'm not sure where Skype is headed now that their under Microsoft's auspices, but there are other companies that offer internationally redirected numbers as well (though it's generally much pricier).

The US area code 707 covers northwestern California, so it is possible that the +7 should be a +1.

Except 112-0122 does not represent a valid US 7-digit phone number, because it starts with a 1, and local numbers can only start with 2-9. See https://en.wikipedia.org/wiki/NANP.

You can change to Russian language, so I bet they are from that area.