ns1.samtel.ru has no CNAME records.
Question and response
Question
dig ns1.samtel.ru. NS
Answer
The response has no answer records.
Authority
SAMTEL.RU. 6662 SOA ns1.SAMTEL.RU. root.SAMTEL.RU. 2026021801 28800 3600 1814400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0