troubleshooting Question

Cisco 7940 IP Phones are taking the IP address from Data Vlan

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Windows Server 2003Voice Over IPDHCP
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I have 300 Cisco IP Phones (7940G) in which only around 40-50 Phones are taking the ip address from Data Vlan ip address range, rest all the ip phones are taking from the voice vlan ip address range.

I have windows 2003 DHCP Server in which Data Vlan & Voice Vlan is created each having 512 IP Address, both have sufficient free IP Address.

Ip Helper address command is fine and all the ports are added to voice vlan. Everything was fine but now i am facing this problem like some phones are taking the IP Address from Data Vlan.

Can somebody pls let me know how to rectify it.
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