[cisco-voip] CCM Upgrade - Best Practices

[Ryan Ratliff]

The easiest way to ensure phones don't register to servers during the  
upgrade is to disable or set to manual startup the CallManager  
service on the servers being upgraded.   That way you can do the  
upgrade, reboot the server, and take a look at things before having  
phones fail back to it.

-Ryan

On Oct 24, 2007, at 9:53 AM, STEVEN CASPER wrote:


  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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