Make sure that IP Communicator can get the TFTP server through DHCP using option 150 or 66 (preferably 150) or that you have manually configured the TFTP server in IP Communicator as shown in the following link.
Obviously define the ip address of the CCME 4.0 in the IP Communicator.
I had a registration problem with the same setup, and it turned out that it was because I had NAT enable on the CCME. Once I removed NAT, (the data was the outside interface, the voice was the inside), then the CIPC registered OK.
Also, you need to ensure that the ACLs for your VPN also allow for the voice network.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...