CallManager 7.02 Maximum Number of Registered Devices

We are currently running CallManager version 7.02 with the following configurations:
One Publisher and two Subscribers
CM Groups - 2
Sub1-CMG (used by 9000 devices)
    Sub1
    Sub2
    Pub
Sub2-CMG (used by 4475 devices)
    Sub2
    Sub1
    Pub
Maximum Number of Registered Devices - 10000
1) We just added some more devices that changed to number of devices to:
Sub1-CMG (used by 10050 devices)
Sub2-CMG (used by 4475 devices)
So, some of the new devices did not get registered with CallManager.
2) We changed the Maximum Number of Registered Devices to 12000
When we checked the new devices, there were still some that were not registered.
3) If we move the new devices to Sub2-CMG they register with CallManager.
Any thoughts here?

Since you are on CUCM 7, this means your cluster is running on MCS servers, from memory I think the top level MCS server in CUCM appliance mode supported upto 7500 phones per server. So you may be running into a hardware limit. Although you can configure I guess upto 15000 phones in the CUCM service parameter but still the MCS appliance mode had the 7500 phone/server limit with a max of 30,000 phones per cluster.
So either you have a MCS 7845 I2 or H2 the limit is 7500 per server (I am guessing you have top model of the MCS from number of phones you have otherwise limit will be further lower):
http://www.cisco.com/c/en/us/products/collateral/unified-communications/7800-series-media-convergence-servers/product_data_sheet0900aecd80572724.html
-Terry
Please rate all helpful posts and mark the thread as answered if you have no other queries

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