Setting up DHCP server for IP Phones with 2008 R2

I have one DHCP server on my network running 2008 R2 Ent.  My LAN is 192.168.26.0/24.  We're getting a new Avaya IP system that will be set up on a new 192.168.27.0/24 network.  We want to use the same DHCP server for the IP Phones as our data phones.

Isn't there a way to set up the DHCP server to hand out the 27.0 addresses to just the phones?  How is that done?
sedberg1Asked:
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sedberg1Connect With a Mentor Author Commented:
Found these two links which are helpful.  I'll have to test this out:

http://www.ipofficeassistance.com/HOWTO_DHCP_IP_Phones.html

http://blogs.scansource.com/how-to-configure-avaya-ip-phones-to-use-dhcp-and-vlan/

Basically, I have to specify some parameters in the DHCP scope of the data VLAN to tell the phones to use the voice VLAN scope.

Sorry for answering my own question, but thanks everyone for the suggestions.
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José MéndezCommented:
What type of infrastructure do you have? Are there Cisco switches by any chance?
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ramromconsultant Commented:
Use OpenDHCP Server (free)

Config file (opendhcpserver.ini)

[RANGE_SET]
# non-phone devices
DHCP_Range=192.168.0.100-192.168.0.149

[RANGE_SET]
# change mac address range to suit your phones
Filter_Mac_Range=00:0b:82:00:00:00-00:0b:82:ff:ff:ff
DHCP_Range=192.168.270.1-192.168.27.254

[GLOBAL_OPTIONS]
Lease_Time=691200
LogLevel=All
Router=192.168.0.1
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ramromconsultant Commented:
http://sourceforge.net/projects/dhcpserver/

If you need to specify a TFTP server add
66=192.168.27.nnn
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ramromconsultant Commented:
what do you mean by "data phones"?
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Ashok DewanFreelancerCommented:
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Radhakrishnan RSenior Technical LeadCommented:
Hi,

You can create a new scope which starts from 192.168.27.0  and end to 24, create a new reservation for your 24 IP phone's (you should provide the mac address of the each IP phone in order to reserve). Authorize the scope with Active directory, so that the IP phones will get the same IP (you have to provide the manual address on the IP phones).
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sedberg1Author Commented:
I mean IP phones, not data phones.  There's a Dell Powerconnect 6224 L3 switch connecting that will be connecting the voice VLAN and the data VLAN.  The thing is, what our phone upgrader wants to do is connect all the computers to the switch on the IP phone, then the IP phone to the wall jack on the wall.  All the wall jacks will be terminated to punch panels (they already are) and then connected back to the Avaya switch.  VLAN 10 is for the computers, and VLAN 20 is for voice.  The Avaya switch will then connect to the L3 switch which will relay DHCP requests to the DHCP server.  So I can't multihome the DHCP server, which is virtual anyway.
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sedberg1Author Commented:
This is the best answer and fits exactly what is needed for the solution.
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