Apex domains cannot have CNAME records.
Question and response
Question
dig avantel.webcam. NS
Answer
avantel.webcam. 3 NS ns2.avmailer.ru.
avantel.webcam. 3 NS ns1.avmailer.ru.
Authority
The response has no authority records.
Additional
ns1.avmailer.ru. 3 A 93.91.168.162
ns2.avmailer.ru. 3 A 95.170.144.167
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0