CCX upgrade 12.0 to 12.5

[dannoofWI]

I see we need to increase RAM to 20GB for our 400 agents.

There is also mention of losing certificate CA's for our privately signed certs. Is that just a matter of copying the CA's from the server and reinstalling post-upgrade?

Is there anything else I have to watch out for?

How long should this upgrade take for a HA  server arrangement?

[Shalid Kurunnan Chalil · Accepted solution]

Hi there, 

I did the upgrade from 12.0 to 12.5 su1 last weekend. It took me around 3 hours per server to upgrade to base version. Please increase the RAM prior to upgrade else your upgrade fails. I didn't copy the certificates and didn't see any issue in the production ( my understanding that it is required for CCP). Fortunately, I didn't experience any issues during and after the upgrade.  

Also, do the standard upgrade procedures  such as connectivity check (DNS, NTP), take the back up, perform during maintenance window. 

I am sure that you have referred the upgrade steps outlined in the document : CCX 12.5 upgrade guide  but just placing it here for the reference. 

If you are also upgrading the CUCM, ensure that you performed jtapi sync from the CCX. 

Regards, 

[Shalid Kurunnan Chalil]

Hi there, 

I forgot to mention earlier. you may find problem in CUIC cluster formation if your network doesnt support multicast. so you may have to change the clustering mode to tcp/ip. 

Please check the CUIC cluster formation and troubleshooting 

usefull commands: 

utils cuic cluster show

utils cuic cluster mode 

Regards,