Cisco 3524 Voice VLAN and Data VLAN

hello, im trying to configure my network with multiples vlans (voice and data vlans). I'm using Cisco catalyst 3524TXL. Im configuring access ports(5,6,7) with voice vlan on each interface too (VLAN Voice: 2; Data vlans: 5,6,7). Im routing with a Cisco Router 2821, i created in the router subinterfaces for voice vlan, data vlans and a ip helper in each subinterface. The DHCP server was configured with scopes for each vlan. I made some test with statics ip address on the computers and it can do intervlan routing, but when i configure it to take dynamic address it doesn't receive any offer (the phone neather).

Can somebody help me with this issue? Any similar Scenario?

Overview of the switch interface configuration:

interface FastEthernet 0/5
switchport access vlan 5
switchport voice vlan 2
no shutdown

Overview of the router interface configuration:

interface GigabittEthernet0/1.1
description Voice SubInterface
encapsulation dot1Q 2
ip address 172.16.0.254 255.255.252.0
ip helper-address 192.168.9.15

interface GigabittEthernet0/1.2
description Subnet subinterface
encapsulation dot1Q 5
ip address 192.168.5.254 255.255.255.0
ip helper-address 192.168.9.15

interface GigabittEthernet0/1.3
description Subnet subinterface
encapsulation dot1Q 6
ip address 192.168.6.254 255.255.255.0
ip helper-address 192.168.9.15

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I will appreciate any help !!