I'm running CCM 4.1(3), currently having a unique situation.
Just deployed 3 IP phones, a 7941, 7902 and ATA-186.
The 7941 works perfectly fine, however the 7902 and ATA were not, they seems to be not able to register with the CCM.
When I brought the 2 problem unit back to my office at level 2, they worked fine, again when I brought them back to level 5, the problem persisted.
All the IP phones are connecting to a CE500 PoE switch, all ports Voice and access vlan are verified. I've also swapped the ports with the working 7941, but to no avail, the CCM still shows the phone as not registerd and the IP address showing level 2 office vlan
I've removed the IP address lease from the level 2 VLAN DHCP service, but still it does not register.
What could be wrong? how to find out what went wrong. The 7941 is working fine, but not the rest at level 5 vlan