_sips._tcp.xgenplus.com has no CNAME records.
Question and response
Question
dig _sips._tcp.xgenplus.com. NS
Answer
The response has no answer records.
Authority
xgenplus.com. 3130 SOA ns1.dildns.com. shailesh.dil.in. 2025091001 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0