Hi,
I am able to do telnet to respective hosts. NSlookup resuilts below:
nslookup -type="srv" _sip._tls.mcaconnect.com
Server: dtmodcsvdc01.dhrodc.com
Address: 172.29.252.21
Non-authoritative answer:
_sip._tls.mcaconnect.com SRV service location:
priority = 100
weight = 1
port = 443
svr hostname = sipdir.online.lync.com
mcaconnect.com nameserver = ns34.domaincontrol.com
mcaconnect.com nameserver = ns33.domaincontrol.com
sipdir.online.lync.com internet address = 134.170.54.15
ns34.domaincontrol.com internet address = 208.109.255.17
ns34.domaincontrol.com AAAA IPv6 address = 2607:f208:302::11
ns33.domaincontrol.com internet address = 216.69.185.17
ns33.domaincontrol.com AAAA IPv6 address = 2607:f208:206::11
>nslookup -type="srv" _sipfederationtls._tcp.mcaconnect.com
Server: dtmodcsvdc01.dhrodc.com
Address: 172.29.252.21
Non-authoritative answer:
_sipfederationtls._tcp.mcaconnect.com SRV service location:
priority = 100
weight = 1
port = 5061
svr hostname = sipfed.online.lync.com
mcaconnect.com nameserver = ns33.domaincontrol.com
mcaconnect.com nameserver = ns34.domaincontrol.com
ns34.domaincontrol.com internet address = 208.109.255.17
ns34.domaincontrol.com AAAA IPv6 address = 2607:f208:302::11
ns33.domaincontrol.com internet address = 216.69.185.17
ns33.domaincontrol.com AAAA IPv6 address = 2607:f208:206::11
Here my point is that we dont have sip records for mcaconnect.com. its all pointing to online.lync.com domain. I havve reference to the article http://uclobby.com/2014/07/07/no-match-for-domain-in-dns-srv-results/.
That is only clue left. Meanwhile, I have got another observation that user is not able to do chat with many other external domains
Thanks & Regards,
Vinay Mishra