Two switches connected with fiber in mode trunk - Problem

Hi to all.
Iam new in the forum, and my english is bad.
I want to post a problem. I have two switches connected with fiber in mode trunk, in the switch C3550 i have this configuration:
interface FastEthernet0/1
description Enlace LAB Medicion
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
duplex full
spanning-tree portfast
In the switch C2960 this configuration, on interfaces Fa0/48, Giga0/1:
interface FastEthernet0/48
switchport trunk allowed vlan 1,20,229
switchport mode trunk
spanning-tree portfast
interface GigabitEthernet0/1
switchport trunk allowed vlan 1,20,229
switchport mode trunk
media-type sfp
duplex full
spanning-tree portfast
The problem:
The ip phones with Voice vlan (vlan 20), not find the DHCP server located in the data vlan (vlan 229)
However, using the command:
#switchport trunk native vlan 229
The result is the voice vlan works, but the data vlan not and viceversa depending if the native vlan 229 is present.
I will appreciate any suggestion.

leolaohoo.
The configuration on ports switch C2960, have the mode access with voice vlan 20:
interface FastEthernet0/1
switchport access vlan 229
switchport mode access
switchport voice vlan 20
spanning-tree portfast
interface FastEthernet0/2
switchport access vlan 229
switchport mode access
switchport voice vlan 20
spanning-tree portfast
I will remove from trunk links:
spanning-tree portfast
Thanks alot.

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