How To Upgrade Cisco Call Manager Cluster

[@schertzer98]

Thanks man, super helpful.

[@Eduardo93319]

Great tutorial ! Can I do the upgrade to the inactive partition in business hours ? Is there any impact during that process ? Thx

[@lukasibanda6730]

Great tutorials on cucm upgrades

[@joecurrier5598]

thank you for a simple tutorial man

[@aawaaeejee5979]

Hello nice video. I am also going upgrade 11.5 to 12.5 version. I have 2 subscribers and 1 publisher. 1: Publisher upgrade and version switch, 2: Subscriber 2 upgrade and version switch 3: Subscriber 1 upgrade and version switch. Does this not affect the production? Please provide video for UNITY and CCX upgrade?

[@RockStoneCold260]

Very nice tutorial thank you! What is the behavior of the phone during switch version? Does the phone reboots to re-register failover to Sub?

[@simpleciscovoicetutorials79]

There is a super brief fail-over message displayed on the phone - less than a second.

[@RockStoneCold260]

@@simpleciscovoicetutorials79 got it thanks for your reply. So it wont go to phone cold reboot for registration during failover.

[@simpleciscovoicetutorials79]

@@RockStoneCold260 Not if you've set everything up properly 😬

[@pakhilko]

I am also going to upgrade from 12.5 to 14, is there a reason not to use "utils system upgrade cluster" and run "utils system upgrade initiate" separately on publ. and subscr. like you did?

[@dikon10]

@simpleciscovoicetutorials79 Do we need to use the OVA template fro CUCM V14 or we can manually change VM configuration in production in maintenance window will this affect upgrade Tac suggesting OVA Template

[@MotoTrackSide]

is this the same process for service updates?