DNS server tip for Cisco Jabber

Hello, today I note some tips for Cisco collaboration product.

Recently, Cisco have driving strongly for collaboration infrastructures and endpoints.
Especially, CUCM and CUP ver.10 are main collaboration infrastructures for using voice&video call, messanger.

But, they need even 2 DNS Servers. Internal DNS Server and External DNS Server.
Internal users set their PC to find their internal DNS Server.
then External DNS Server do not advertise CUCM and CUP servers. just advertise Expressway-Edge's SRV record.



[Internal DNS Server]

cucm.collaboration.com
cup.collaboration.com
_cuplogin._tcp.collaboration.com
_cisco-uds._tcp.collaboration.com
_sip._tcp.collaboration.com
_sips._tcp.collaboration.com
_sip._udp.collaboration.com
_h323cs._tcp.collaboration.com
_h323ls._udp.collaboration.com



[External DNS Server]

edge.collaboration.com
_collab-edge._tls.collaboration.com
_sip._tcp.collaboration.com
_sips._tcp.collaboration.com
_sip._udp.collaboration.com
_h323cs._tcp.collaboration.com
_h323ls._udp.collaboration.com



That's why is Cisco Jabber's way for looking SRV records.

Cisco Jabber Client is looking _cuplogin._tcp record first, and then find _collab-edge._tls record second.
so If External DNS Server advertise _cuplogin._tcp record first,
Client could not access the internal CUP server at external network.

Check the your DNS server and divide your DNS server.



Internal DNS Setup.zip