Phone line- yes or no - DirecTV DVR

For Phone line- yes or no, relating to DirecTV DVRs and receivers. I am convinced that a land line is not necessary for the DVR/Tivo to function properly; however, what is this initial setup that a land line is needed for. Can I do the set up at my neighbors house using their phone line, or does my DVR receiver need to be connected to my satellite? All help is appreciated and will dictate what my decision will be (i.e. I am not getting a land line just for DVR)

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