I have a new Unified communication manager installation on tha msc 7815-I2 server.I have about 100 users/phone. I have a great problem , random cpu usage of the server go up until 99% and then phone that are not registered cannot register . I have to restart ccm service to came back to normal operation. A lot of my users use extension mobility. And they also cannot connect or disconnect during ccm cpu problem. Phone that are already registere seems work correctly. Anyone have any ideas?