I have purchased a TP-Link XC220-G3v(US1) v2.30 Router for use with BSNL FTTH and the same is providing a stable internet connection. However, the VOIP for landline connection is not working even when properly configured. As per this forum post (https://community.tp-link.com/en/home/forum/topic/596100?replyId=1170644) a Datecode2301051715 firmware exists which solves the problem. I contacted tp link support email (support.in@tp-link.com) multiple times to send updated firmware, however reply was received only once with a broken download link which they didn't even bother to update. If anyone has the latest firmware, I am requesting to share a working download link. Thanks.