Anyone with an Archer VR300 modem resolved this? 

I've tried the steps in this article https://www.tp-link.com/eg/support/faq/1259/. but wifi calling still didn't turn on. It's available from my ISP and it works when I connect to other wifi networks, but not at home.  It used to work on my home wifi off and on, but now it never works. I've had the same ArcherVR300 router. 

Is there a TP Link router that definitely supports wifi calling? Or anything else I can do?