Could any one tell me the exact usage of Application Server configuration window in CUCM?
I recently integrated CUPS 7.0 and CUCM 7.0,
Adding CUPS server under application server in CUCM was one of the important steps.
After integration, i was able to register my CUPC and tested presence,IM and IPPM features. I then went to CUCM and removed the CUPS IP from the application server window and restarted both the servers. After reboot, I was able to use all the features on CUPC with out any issues and my CUPS server was able to reach CUCM and was in sync. I was not able to notice any difference in the CUPS behavior.
This applies to *any* server in the cluster. *any* means CUCM, CUPS, Unity Connection, etc.
The confusing part is: not *all* traffic relies on this. ie. some traffic will work without this and some traffic will not.
To make things simpler, you should consider this as mandatory.
"won't accept any kind of communication from an unknown IP" is a little bit exaggerated.
CUCM will accept quite a lot traffic from "unknow IP", such as https, ssh, etc.
The entry in "server" and "application server" is used for IPSEC control. Without it, IPSec communication between nodes won't established. The most obvious symptom is "Change Notification" didn't take effect (push update). However, pull update will still succeed.
For example, when you change the DN on CUCM, it won't populate to CUPS automatically. But if you restart SyncAgent on CUPS, it'll pull the update over.