Sorenson Support

I just spent half an hour on the phone with Sorenson technical support. I use software called Envision SL, which is for making phone calls to videophones. I was able to call VRS and see the interpreter, I said I was testing and then disconnected. I wanted to test having a friend call me, but it didn't work. The operator wouldn't take the IP address and I don't have a real videophone so I don't have a VP number. So I don't know how my friends could call me using the IP address. I don't know how to receive an Envision phone call, I don't understand how it works, and the Sorenson technical support was no help.