gateway.wavify.com has no CNAME records.
Question and response
Question
dig gateway.wavify.com. NS
Answer
The response has no answer records.
Authority
wavify.com. 446 SOA aria.ns.cloudflare.com. dns.cloudflare.com. 2396827669 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0