[cisco-voip] CCM Upgrade - Best Practices

[STEVEN CASPER]

 Looking for some advice for the best way to do Call Manager upgrades to minimize system disruptions. From a recent ES doc:
 
"You can minimize call-processing interruptions if you register all devices
to servers that are running the same version of Cisco CallManager during the
entire upgrade process; i.e., you register all devices to the backup Cisco
CallManager servers or the primary Cisco CallManager servers, but not to
both types of servers."
 
 I understand what the ES doc is saying what I am not sure about is the best practice to ensure that all devices stay registered on the backup or primary servers during the upgrade. Should you manipulate your Call Manager groups during the upgrade? 
 
 For instance all of our devices are registered to Subscribers A, B, C, & D. We have two back up subscribers X & Y. Do we:
 
1. Upgrade the Publisher.
2. Upgrade X & Y
3. Change our Call Manager Groups so X & Y subs are the primary.
4. Reset all devices so they re-register to X & Y.
5. Upgrade A, B, C, & D.
6. Change Call Manager groups so A, B, C, & D are primary again.
7. Reset devices.

 
 
Thanks!

Steve Casper
Voice Technologies
M&T Bank
(410) 347-6026

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