Question and response
Question
dig _sip._udp.knipp.de. SRV
Answer
_sip._udp.knipp.de. 86400 SRV 0 0 5060 pbx-sip.knipp.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0