I need instructions on how to forward my Polycom phone to my cell phone so it will forward after 2 rings when I'm working at home. I have done it a couple of times in the past, but it always gets unforwarded somehow, and it seems like it is always problematic to set up. I am trying again this morning and my cell number has gotten the last digit removed, and I don't see a way to correct it. Any assistance would be greatly appreciated!