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.
once in enable mode, goto config mode. then select interface, i.e. f0/0 and then type in the following:
ip address x.x.x.x y.y.y.y where x is your IP address you wish to have and y is the subnet mask
router(config-if)ip address 10.0.0.1 255.255.255.0
Let's look at how to configure basic DHCP on an IOS-based router. For this example, we'll start off with the default configuration on a Cisco 2611 router running IOS 12.2. (The configuration should be the same—or very similar—on all IOS-based routers).
To begin, connect the router's Ethernet port to a switch, and connect the switch to a laptop, which will serve as the DHCP client.
To configure Cisco IOS DHCP, follow these steps, which include sample commands:
1.Configure an IP address on the router's Ethernet port, and bring up the interface. (On an existing router, you would have already done this.) Router(config)# interface ethernet0/0 Router(config-if)#ip address 184.108.40.206 255.0.0.0 Router(config-if)# no shutdown2.Create a DHCP IP address pool for the IP addresses you want to use. Router(config)# ip dhcp pool mypool3.Specify the network and subnet for the addresses you want to use from the pool. Router(dhcp-config)# network 220.127.116.11 /8 4.Specify the DNS domain name for the clients. Router(dhcp-config)#domain-name mydomain.com5.Specify the primary and secondary DNS servers. Router(dhcp-config)#dns-server 18.104.22.168 22.214.171.124.Specify the default router (i.e., default gateway). Router(dhcp-config)#default-router 126.96.36.199.Specify the lease duration for the addresses you're using from the pool. Router(dhcp-config)#lease 78.Exit Pool Configuration Mode. Router(dhcp-config)#exit
connect a crosscable between your cisco 7940 and the laptop start a dhcpserver and a tftpserver on your laptop The files i mentioned (SIP license) have to be purchased at Cisco. start the IPPhone, thats all