Question and response
Question
dig rediris.es. NAPTR
Answer
rediris.es. 7200 NAPTR 2 0 "s" "SIP+D2U" "" _sip._udp.rediris.es.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0