mx7.tatacommunications.com has no CNAME records.
Question and response
Question
dig mx7.tatacommunications.com. NS
Answer
The response has no answer records.
Authority
tatacommunications.com. 6457 SOA ns2.tatacommunications.com. tcl.dnssupport.tatacommunications.com. 2023100898 86400 14400 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0