You will get to know the fact once you connect with BSNL ISP. Their Application clearly says TPlink make/model is no more supported by BSNL

@TPLink This feature should be considered for all other models as well. My recent procurement on TPlink XC220-G3v has no TR-069/CWMP and hence couldnt proceed ahead with the BSNL ISP FTTH...

@DrShirish I've come across your post and procured this XC220-G3v for a brand new BSNL FTTH Service connection. I was able to configure the router myself. And the internet works intermittently....