The My Century Link option shows up on five of my six HR2x/H2x receivers. The only one it doesn't show on is the HR24-100. All six receivers are DECA connected and also connected to the internet. Is there some trick to getting it to appear on the last box? How is CL sending the call waiting signal to teh receivers? Is this through the internet connection as I don't have a phone line connected to any of the boxes?