How would you set up a cisco or adtran switch and VoIP with Vlans and properly assigning DHCP?

Just looking for some hints and perhaps the right path to start.

Have the need to setup IP Phones on a network with either an adtran or cisco PoE managed switch.
I believe it will involve the need for vlans.

need each phone to pickup DHCP in a windows 2008 R2 server domain, there are two sites involved that will be connected via MPLS, both sites have a DC with DHCP/DNS and a /24 IP mask.
Approx. 30 phones in both sites

i'm unclear on the best way to attack this with vlans on a switch, thinking of doing a new IP range to allow for growth but wondering if anyone can point me in the right direction with DHCP settings, Vlan, and switch settings.
any ideas or thoughts?
AMtekAsked:
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rharland2009Commented:
Here's what I would do, if these phones and computers had to co-exist on the same switches and share a port (most IP phones have a small two-port switch to allow this configuration).
I would set up one VLAN for phone, one for computer.
I would set up two DHCP scopes on your DHCP box - one for phones, one for computers.
I would work with my phone vendor to ascertain the correct DHCP options (settings the phones will receive on first assignment that will usually have them reboot into a new VLAN and get the correct address, etc.) and assign those DHCP options to the phone scope.
I would then on the switches set each port that a phone and computer would share to untagged/native in computers VLAN and tagged in phone VLAN.
The way it would work is this - phone gets plugged in, gets DHCP address with options, reboots into appropriate VLAN. Computer plugs into two-port switch on phone, boots up normally and gets DHCP address from computer scope. You'll have to assign helper addresses so the DHCP discover packets can get to the DHCP box. Pretty vanilla.
That's where I'd start, anyway.
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