chatalot,
If your ATA is not used at any other location then you don't need to depend on a stun server. I would recommend the following settings.
In addition to the SIP ports, forward the entire RTP port range.
Handle VIA received: YES
Handle VIA rport: YES
Insert VIA received: YES
Insert VIA rport: YES
Substitute VIA Addr: YES
Send Resp To Src Port: YES
STUN Enable: NO
STUN Test Enable: NO
NAT Mapping Enable: YES
NAT Keep Alive Enable: NO
Proxy: us.voxalot.com:5060
Outbound Proxy: us.voxalot.com:5060
Use Outbound Proxy: YES
Use OB Proxy In Dialog: YES
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