Normally in such issues we start by comparing the settings of the working and non working phones on CUCM ( device page and end user page). If those are consistent then you can check if the issue is being faced by a specific phone model , or phones in a specific device pool or connected to a specific switch. Once all of these are verified then we can take a packet capture from the working and non-working phone to check the signaling with Paging system.
Manish
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