What is your UCM version and IP phone firmware version? Typicaly firmware version issues can be fixed by factory resetting the phone. To do this unplug the power, hold the # button and plug the power back. Wait for MWI light flash or line buttons sequential flash (depends on model) and release the # button, than dial 123456789*0# - the phone will be reset and start downloading firmware from UCM.
This will work only if you have correct ucm and dhcp configuration, otherwise phone will not load.
am not using the UCME, am using CUCM 22.214.171.124000-1. This was working before whereby the ip phones auto registers with CUCM when l finish doing the configuration. What l now did was to enter the mac address into the CUCM manually. U will notice that it was not an auto registration which l want it to be , this was doing that before. This a lab hands on which l using to practise. The ATA 186 could not register with the CUCM but l could see it registered with the cisco router 2801.Pls help
State and IP address "Unknown" shows that there were no successfull or unsuccessfull registrations for this device since UCM boot. If the MAC right check the ATA configuration - it should be configured by DHCP or have a correct UCM address in config. And it should have SCCP firmware.
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