I currently have a 510 and it's hooked to a phone line. Mainly for caller-ID. We hardly ever buy PPVs. I just ordered a 625 from Dish ($69 including installation) and they told me I had to have a phone line attached otherwise there's a charge. The 625 (it will get the phone line attached to it) will replace the 510 and the 510 will move upstairs. Will I need to have a phone line attached to both receivers to meet that requirement?