Apex domains cannot have CNAME records.
Question and response
Question
dig voztelecom.net. NS
Answer
voztelecom.net. 5 NS ns2.voztelecom.net.
voztelecom.net. 5 NS ns1.voztelecom.net.
Authority
The response has no authority records.
Additional
ns1.voztelecom.net. 5 A 193.22.119.22
ns2.voztelecom.net. 5 A 217.18.237.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0