Phone stuck at "Configuring IP"

So recently we moved about 50 phone devices (Cisco 7945's) from one area to another in our DR site. When we did most of them came up with bootstrap, however, got stuck at "configuring IP". We later learned of a known issue from the Cisco switch team that because we moved the phones from one VLAN to another on the same subnet the phone remained in this state. We know that a DHCP release must be performed to flush the IP configuration before moving according to switch team.
However, the phone group indicates this is not cached information and that CDP sends out a request to the switch for its VLAN information and then request an IP form the DHCP server.
Once the phones were stuck in this state we manually erased the DHCp configuration from the phone and they came up fine. We did leave several in the Configuring IP state, (NOTE: we know this Configuring IP state is dynamic to general network connectivity issues as we see it when a phone can only bootstrap and not even reach the network) and when I came in the next morning they were all up and registered.
The big question is, "What released the information to bring the phone online?" Was it the switch that timed out or the phone that finally flushed the information and sent a valid CDP request?
Thanks,
Tom Harshman

Hi Chitra,
Are you using manual or automatic registration. If it is automatic please make sure that the same is enabled under callmanager group and under Unified CM on the cucm admin page. Also make sure that the phone with configuring IP message has got the correct IP address and is pingable from cucm.
HTH
Manish

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