How do you get all phones to pick up a new tftp load after an upgrade on CUCM 8.5?

I have 2800 phones that need to get a new phone load.  Will they keep trying to get the new load?  What is the time out and can it be reset to longer?

As long as the phones are not hardcoded at the device level with an older load then they will upgrade (assuming the current load is compatible) when they are reset.  It sounds like you are more concerned about all the phones rebooting at once.  If that's the case then you will need a way to reboot subsets of phones in an orderly fashion.  At NetCraftsmen, we use a custom script to do this which pulls IP phone registrations and sort them in a way that makes sense for the customer environment.  The end result is we use BAT to reset groups of phones in a controlled manner to control the upgrade and load on the TFTP servers, etc.  As noted before, you can do this via Device Pools, device types, or you can also sort out some custom BAT files to do the same on your own.  The only caveat is that any phone that gets reset in the interim (whether from CUCM or otherwise) will upgrade either way.
Hailey

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