sip.2atelecom.net.br has no NS records.
NS records for this zone are defined at 2atelecom.net.br.
NS records for this zone are defined at 2atelecom.net.br.
Question and response
Question
dig sip.2atelecom.net.br. NS
Answer
The response has no answer records.
Authority
2atelecom.net.br. 1800 SOA paislee.ns.cloudflare.com. dns.cloudflare.com. 2394884885 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0