Apex domains cannot have CNAME records.
Question and response
Question
dig static.fusionconnect.net. NS
Answer
static.fusionconnect.net. 5 NS ns02.fusionconnect.net.
static.fusionconnect.net. 5 NS ns01.fusionconnect.net.
Authority
The response has no authority records.
Additional
ns01.fusionconnect.net. 5 A 216.86.60.11
ns02.fusionconnect.net. 5 A 69.60.195.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0