sip_nat.conf Advice

Afternoon everyone, looking for some advice on what my sip_nat.conf should look like, below is a brief description of my network

Static external IP for TB 94.x.x.x
Trixbox sits in the DMZ with local ip of 10.10.0.x/24
Voice VLAN 10.10.200.0/24

With the above in mind does this mean that my sip_nat.conf should look like

externip=94.x.x.x
localnet=10.10.0.0/255.255.255.0 
localnet=10.10.200.0/255.255.255.0

Any help would be appreciated.

Thanks