Apex domains cannot have CNAME records.
Question and response
Question
dig trans-telco.com. NS
Answer
trans-telco.com. 4 NS srv1.telconet.net.
trans-telco.com. 4 NS srv2.telconet.net.
Authority
The response has no authority records.
Additional
srv1.telconet.net. 4 A 200.93.192.148
srv2.telconet.net. 4 A 200.93.192.161
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0