Those are devices that are registered as you run the query.I cannot test this on a system with thousands of users, as I don't have thousands of users in my lab, so, I'm not too sure about the CPU usage of this, so, use with caution.
This will also require a restart of the XCP router in the IM&P servers for them to complete the configuration.
You can confirm the information from EXP-E has been sent over to the IM&P servers by issuing this SQL query: Those are all the steps you need to perform in IM&P and VCSs to get XMPP federation to work, if something is failing, then you can take a look at the EXP-E logs in order to find out if this might be related to certificates, TLS, SRVs, etc.
Y level, for example: They both match at the 9.1 level and are compatible, even if they are not in the same MR, as long as they keep in 9.1, they will be compatible.
At this time, the only release that breaks the rule is 10.5(2): IM and Presence Service and Cisco Unified Communications Manager Upgrade to 10.5(2) IM and Presence Service Release 10.5(2) is compatible only with Cisco Unified Communications Manager Release 10.5(2). Y(Z) level, always make sure to review the Release Notes for the product before upgrading or installing to make take into account any special considerations like the above.
Go to CUPS/IM&P FAQ Content Table The whole procedure is outlined in the CUCM upgrade guide: Upgrade Overview You can find the rest of the guides for old, and upcoming versions under the CUCM documentation page if you click Install and Upgrade Guides Make sure to review the whole guide and pre-reqs before attempting the upgrade, put special notice on which procedure applies to you, and whether you need to switch to the new version immediately, or upgrade all nodes before switching, that is a very important step and can cause problems in case you fail to follow the proper procedure.
Go to CUPS/IM&P FAQ Content Table This information is listed in several places, remember that you need to look into the CUCM documentation for IM&P as well.
Reference: Upgrade Paths for IM and Presence Service 10.x Go to CUPS/IM&P FAQ Content Table There are two outstanding bugs related to this, please review the information about them: Why would you want this??
The procedure itself has not changed that much from the old CUPS, the most important difference is that now before you start the install, you need to add the IM&P server under CCMadmin - Server, and that the first run does no longer have the AXL integration as IM&P will get all that information during the install phase as it's directly connected to CUCM.