Cisco COP File Installation Process Question

When you add a COP file to a CUCM (10.5) cluster I understand you should install the COP file to the publisher first and reboot it. Then install to the 1st subscriber and reboot it. Then do the same for the second subscriber. Does this cause any downtime for the phones and call processing beyond the normal process of phones registering to their next in priority UCM when their UCM is rebooted? My guess would be no. But I don't have a lab to be certain. Thank you. Anything I might be missing?
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amigan_99Network EngineerAsked:
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buckethead34Commented:
The phones should be registered to the subscriber, so when the publisher reboots and goes through the upgrade it should be fine. Then when you do the upgrade to the subscriber the phones will most likely failover to the Publisher and also reboot and upgrade their firmware. So I would expect minimal downtime and have done upgrades and this is how it worked. I still made sure to do them in a maintenance window, you can never be sure that the upgrade will go as expected.
buckethead34Commented:
I just read over your question again, you are not doing a complete upgrade? Just installing a COP file?
amigan_99Network EngineerAuthor Commented:
Right - there's no upgrade. I'm just adding a COP file so that the "User Credentials Persistent for Expressway Sign-In" in the devices and phone group. 10.5 out of the box appears to not have this.
buckethead34Commented:
I would think that the phones will act the same, with exception that there will not be firmware upgrades. I would still recommend doing it after hours if possible though.

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amigan_99Network EngineerAuthor Commented:
Ok - that's the plan. Thanks.
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