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Vlan passthrough

Dear experts,

I'm having trouble configuring my ASA 5510 firewall for passthough vlans.

I want to passtrough vlans from the "outside" interface to the "lan" interface.

The ISP provides VOIP as a service to our company on the same internet connection on the seperate Vlan.

The ASA has to filter the internet access (untagged traffic) but has to pass trough the voice traffic (tagged traffic)

to the lan interface. the ISP also provides DHCP for my ip phones, so the asa also has to passtrough dhcp requests.

do i need DHCP relay?

i'll tried to connect 1 vlan to multiple fysical interfaces but i get an error message that this is not posible

Is this posible using the ASDM interface or do i need to configure this by the CLI?

I attached a drawing how the environment must look like.

Hope someone can help me out here.

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