Question : Cisco 7945G IP Phone DHCP Problem

I am trying to configure a Win2k3 server as a DHCP server for my Cisco 7945G IP Phones. The phones are in VLAN 20 and the PCs are in VLAN 10. I have two DHCP scopes built on the server. All PCs, even the ones plugged into IP phones, are able to pull IPs fine. The phones are not pulling IPs though.

The phones are stuck on "Configuring IP". When I do a packet sniff I can see the "DHCP Discover" message from the phone, and the subsequent DHCP Offer message from DHCP server (via router proxy). The DHCP offer message has the client IP and the phone mac address. So the phone looks like it should get the right address but it just keeps sending DHCP Discover messages from IP 0.0.0.0 as if it doesn't see the Offer messages.

Here is the IP port config on the switch (cat 3550):

interface FastEthernet0/24
 switchport access vlan 10
 switchport mode dynamic desirable
 switchport voice vlan 20
 spanning-tree portfast

Here's the port on the cat3550 that is uplinked to the 2811:

interface FastEthernet0/1
 switchport access vlan 20
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 switchport trunk allowed vlan 10,20
 switchport mode trunk
 switchport voice vlan 20

Config on the 2811:

interface FastEthernet0/0.10
 encapsulation dot1Q 10 native
 ip address 192.168.10.1 255.255.255.0
!
interface FastEthernet0/0.20
 encapsulation dot1Q 20
 ip address 192.168.20.3 255.255.255.0
 ip helper-address 192.168.10.13

Any ideas?

Answer : Cisco 7945G IP Phone DHCP Problem

try to use another server, from my point of view the problem in the DHCP because the phones worked with Router and CUCM