most of time, we use one DHCP server assigning ip for multiple vlans, then configure ip helper address on the SVI to forward the DHCP request to DHCP server. when you are using Windows 2008 server, you might have problem with "superscope" setting, put multiple subnet within one superscope, the client ( especially the cisco IP phone). in this case, you need convert the superscope to multiple regular scope.
second point is CDP, when you use multiple brand IP phones, the voice vlan can't detected by CDP, you might need enable LLDP.
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