example.net.
IN NAPTR 100 10 "" DOTS:signal.udp "" signal.example.net.
IN NAPTR 200 10 "" DOTS:signal.tcp "" signal.example.net.
IN NAPTR 300 10 "" DOTS:data.tcp "" data.example.net.

signal.example.net.
IN NAPTR 100 10 "s" DOTS:signal.udp "" _dots-signal._udp.example.net.
IN NAPTR 200 10 "s" DOTS:signal.tcp "" _dots-signal._tcp.example.net.

data.example.net.
IN NAPTR 100 10 "s" DOTS:data.tcp "" _dots-data._tcp.example.net.
IN NAPTR 200 10 "a" DOTS:data.tcp "" b.example.net.

_dots-signal._udp.example.net.
IN SRV   0 0 5000 a.example.net.

_dots-signal._tcp.example.net.
IN SRV   0 0 5001 a.example.net.

_dots-data._tcp.example.net.
IN SRV   0 0 5002 a.example.net.

a.example.net.
IN AAAA  2001:db8::1

b.example.net.
IN AAAA  2001:db8::2