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Voxbone supply these and they now have POP in New York for better performance in USA and Australia.
You don't have to be a Japanese resident, setup is US$12 and then US$14.50 per month. Normally you have to pay a bond for a phone number in Japan. You don't pay for incoming call time.
I found one other company offering Tokyo numbers, but I think they are just reselling the Voxbone product.
There are many problems with Skype (security, bandwidth, CPU load, non-standard) and it is very difficult to integrate with standards based office PBX.