Question and response
Question
dig sip.efolder.net. NS
Answer
sip.efolder.net. 5 CNAME sipdir.online.lync.com.
Authority
online.lync.com. 15 SOA ns1-33.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0