Powerconnect N2000 series - Configure Voice and Data VLAN on same interface

Hello Experts,

I need to configure a large number of Dell Powerconnect N2048P switches. We have:
Voice VLAN 20
Data VLAN 30

1.) We need to configure voice and data VLANs on the same interface. So, interface fa0/1 will have a VOIP phone connected and accessing VLAN 20, with a computer daisy chained off the IP phone accessing VLAN 30. 

Normally I would use something along the lines of:

interface fa0/1
switchport mode access
switchport access vlan 30
switchport voice vlan 20

Is this the same concept on the Powerconnect N series switches? Or would I configure the interface as a trunk with a native VLAN of the Data VLAN maybe? 

2.) Also, what would be the commands on this N series switch to declare VLAN 20 as the voice vlan?

3.) Also I am looking to enable QOS on the switches, what would be the proper method for this? 

Thanks in advance!