Assuming you are talking about remote phones, you need to program the NCP (call processor) IP into the phones manually or add option 187 to your DHCP scope. The phones are able to DHCP the just also need to know what the IP address of the phone system to connect to is. If the phones are on your local network then this is all unnecessary. They work at layer 2 locally and don't need to use an IP address or DHCP.
The default IP address of the device, depends on the status of the network where the device resides, but if the device is not connected to the network, or no DHCP server exists in the subnet where the device resides, you can get the default IP address of the device on the label on the right of the device rear panel.
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