I just set up pagegate in about 15 minutes. It was very simple and I used the getasci interface. I didn't need to do anything in Orion other than setup the alert to page after setting up Pagegate. Plus pagegate runs as a service where Notepager pro is an application that has to be running to work correctly.
I will say that both Solar Winds and Notepage have poor documention when it comes to setting up the integration of the two products (or I could not find it on their sites). I got assistance by e-mailing support at Notepage. I worked with Jeremy at Notepage and he was a great help and answered all of my questions. I am going to see if he is willing to update this thread furhter.