2811 Fa0/0 ----trunk----Fa0/1 3560

2811
!
interface FastEthernet0/0
  no ip address
no ip proxy-arp
ip accounting output-packets
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation dot1Q 10
ip address 10.10.1.1 255.255.255.0
no snmp trap link-status
!
interface FastEthernet0/0.2
description voice
encapsulation dot1Q 20
ip address 192.168.1.1 255.255.255.0
no snmp trap link-status
!

3560
!
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
...........
interface FastEthernet0/4
switchport access vlan 10
switchport mode dynamic desirable
switchport voice vlan 20
switchport priority extend trust
mls qos trust cos
spanning-tree portfast
!
interface FastEthernet0/5
switchport access vlan 10
switchport mode dynamic desirable
switchport voice vlan 20
switchport priority extend trust
mls qos trust cos
spanning-tree portfast
!
...........

оно?