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4 steps to overcome this problem :
1. Make sure the device name is the SEPXXXXXXXXXX(Eg: SEP12K3J3J34J34) in phone config page
2. Change from default to statically assigned TFTP (CUCM secondary and primary)
3. Go to security settings, erase the CT...
System tries to correct itself every 2 hours. If needed resync the floors to the MSE.
check the below XLs document.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwij9vbGlL_PAhUILSYKHbnVBBUQFggcMAA&url=https%3A%2F%2Fwww.c...
