Problem - Remote Viewing

ISP - YBB Japan using YBB Japans Modem/Router

Our Slingbox is located in Tokyo at our parents house.
We tried setting up the Slingbox last time we were there visiting Japan. We were able to setup local viewing, no problem. In regards to setting up the remote viewing is were the issues come in.
We are not able to get past the port fwding problem. Anyone else out there with experience? You insight would be appreciated.