Apex domains cannot have CNAME records.
Question and response
Question
dig otelco.net. NS
Answer
otelco.net. 5 NS ns1.otelco.net.
otelco.net. 5 NS ns2.otelco.net.
Authority
The response has no authority records.
Additional
ns1.otelco.net. 5 A 66.0.60.9
ns2.otelco.net. 5 A 66.0.32.14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0