Filtering by MAC address

[Olivier Nicole]

Hi,

On my network, I want my DHCP server to give a public IP address to
the computers and a private IP address to all the VoIP phones.

The VoIP phones are all Cisco, so I can identify the by the vendor
prefix of the MAC address.

How to configure my DHCP server to give IP from one range is the MAC
address is from Cisco and give IP from another range else?

Best regards,

Olivier