[Asterisk-Users] Problem using SPA-2000 behind NAT

[Patrick Conroy]

> > Enable STUN on the SPA-2000 and use (for example) stun.fwdnet.net:3478
> > as the STUN server. I have a SPA-3000 working perfectly like that.

I just tried this and unfortunately it didn't help.  

I did a side-by-side comparison of an X-Lite client and the SPA both
behind the same NAT.  The X-PRO works perfectly in both directions. 
The SPA works only if it initiates the calls, otherwise no audio in
either direction.  In an example of the same SIP message sent to both
clients, it looks like message to the SPA has the private IP in the
"Via" header and the public IP in the "To" header, while they are
swapped (which I assume is correct) in the message to the X-PRO.  Any
ideas what would cause this?

James,  it might be helpful if you could walk me through what you did
to set up your SPA-2000.  Any help I can get to get this thing
working, would be very much appreciated.

Thanks,
Patrick