You actually only have 2.5 VLANs with the 5505. If you use the .5 vlan it has to restrict traffic flow to 1 of the vlans.
Also you can create additional vlans but you can not associate them with access-list or NATing.
You have a couple options.
1) You buy a 5510
2) you use the following setup
WAN = vlan 2 (default for asa5505 -- from memory)
LAN = vlan 1 (aslo default for asa5505 -- from memory)
VOIP = vlan 3 (you will create this)
When you create the VOIP vlan you will choose to restrict flow to VLAN 1 (LAN). If you have a call manager then you will need to place the call manager server in vlan 3 with the VOIP. When you need to access the call manager just plug into a vlan3 port or change a port to vlan 3 for a short period of time.
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