dns2.jazzvisp.com has no CNAME records.
Question and response
Question
dig dns2.jazzvisp.com. NS
Answer
The response has no answer records.
Authority
jazzvisp.com. 5377 SOA dns1.jazzvisp.com. dnsmaster.jazzvisp.com. 2014021108 86400 7200 2592000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0