_sip._udp.vip.hr has no NS records.
NS records for this zone are defined at vip.hr.
NS records for this zone are defined at vip.hr.
Question and response
Question
dig _sip._udp.vip.hr. NS
Answer
The response has no answer records.
Authority
vip.hr. 86400 SOA dns1.vip.hr. dnsadmin.vip.hr. 2026032401 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0