DNS is a mandatory requirement in UCCX 9 onwards for the fact that Social Miner, CUIC and Finesse (10 +) communicate to the server using XMPP that relies only on hostname.
And even in the previous releases of 8.x DNS was mandatory but not hardcoded in the guides. This is because most of the CAD Services uses hostname to connect and a lot of the CAD connectivity issues can be avoided with a DNS.
You can skip the DNS part until 9.x during install, and it would work but it can cause issues later.
Starting 10.x, you cannot proceed without the DNS configuration in the blue screen install.
What happens during an upgrade then? From 8.x to 10.x, if you upgrade it then DNS wont be mandatory but you will need to add the DNS Server once you are 10.x else it will cause problems with Finesse and CUIC.
Note: Changing the DNS Servers will change the License MAC and it will need to be rehosted.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...