New deployment of UC520-48 with 7.04, using CCA 2.2 and ESW 24 port POE switches.
All phones originally registered with system originally. Was build with 7.03 and CCA 2.1.
After upgrade - a bunch of phones stopped working - were either at upgrading or would not register
A phone that would not upgrade or register off the switch would work fine if plugged directly into the UC520
Finally found in the switch logs an entry talking about a locked port LOCKPORTACTIVE
A computer plugged directly into the switch port would work, but a phone would not and a computer through the phone would not
By going into Security, Traffic Control, Port Security and unlocking the ports - we got everything back up.
It appears that SmartPort Settings configure Port Security on these ports differently as phone ports than they do for switch ports as the switch ports were unlocked.
Not sure what caused this but I don't want to run into this again.