Who I have the same questioned this topic

I have followed all the settings on our phones as well adjusting settings per level 3 support on ASUS wireless router but still can not receive incoming calls most of the time. When I unplugged the extender I can receive calls but then I have to put up with low signal strength and dropped calls. Have spent at least 10 hours on hold over the past two months and have gotten no where. There has got to be some kind of software glitch or some other firewall issue that I can't seem to get help with. I am about ready to package the extender up and send it back. So frustrated!!!