Hello Adam,
Is well known and recommended to use a separate vlan for the voice traffic..
With the current license you have you cannot make that as you are already assigning 2 vlans (outside and inside) NO space for Voice vlan.
You could use the same vlan for data and voice and sure it will work but is not the best desing.
I would recommend you to get the plus license man. I mean you have an ASA box... You can do so many thing with this box
Regards,
Julio
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Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC