A friend of mine rang me tonight asking me about setting up a new TP-Link wireless router to replace his current wired only router. As we were going through the stages of unplugging the old router and hooking up the new router the phone suddenly cut out and I couldnt hear him speak anymore. We worked out that when he plugged the new router into the phone jack it was causing the phone line to go dead. Well kinda, as soon as he unplugged it we could hear each other again but when I got him to hang up, plug the router in, then try and call me back he said there was no dial up tone at all. My question is has anyone come across this before and how would I fix it? He said the phone line pllug was literally being pulled out of the old router and plugged into the new one with no other changes being made, and the only other device plugged into the phone line was the phone he was talking to me on, with both devices having filters on them