I have a two cisco CME's and 7940 phones. The router configs are the same except for the IP's of course and one of the routers will not let the phones register. I am using DHCP and that is configured the same on both routers. The vlan on both switches is also configured the same. One set works but the other will not register the phones, they get stuck in Configuring IP. Each phone sees the vlan but does not go any further. The flash on both routers is the same and configure cnf file is in both of the router configs. I am at a loss for why one is working and the other is not. If you have any advice please feel free to help.
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the reason for this would be that it is not getting it's config from the CallManager (or CME router).
The steps in a phone booting up something like this: 1) DHCP for IP Address, and Option 150 for TFTP Server 2) TFTP to address provided by DHCP Option 150 3) Get config file, a(an upgrade of firmware may occur at this point) 4) Connect to Call Manager/CME as specified in config file
First check DHCP server to see if it is allocating an address to the MAC address of the phone Second confirm if DHCP is providing Option 150 and that is the IP Address of the TFTP Server (typically one of your Call Managers) Third check that the phone is correctly configured on CCM/CME. A common error at this stage is that the phone is configured with the wrong model type.
Call back if you get to that stage and are still having problems.