I have been using RTX wireless phone jack for my land line phone, but this has proved to be too unreliable. The first unit I bought failed within a couple of weeks and I was able to return it and got a replacement. But this too failed after about 6 months. I also bought a 2nd extension unit, which has also since stopped working. I think the problem is with the extension unit rather than the base unit, but I'm not 100% sure. Sometimes turning the power supply off and then back on again fixes the problem, but after a while the unit just fails completely and even this trick doesn't work any more. Whether the problem is due to poor manufacturing quality or an inherent defect in the technology, I'm not sure. An internet search hasn't thrown up any alternative wireless solutions, or even the same product made by a different manufacturer. Can anyone suggest any alternatives?