> Alternatively, it's more admin but also more reliable to statically 
> configure everything. Manually configure each SIP device to use a 
> different port for it's SIP traffic, and a different port range for 
> it's RTP traffic. Configure them with knowledge of their public IP, 
> and manually configure your firewall with all the corresponding NAT 
> mappings.
>   
THAT is exactly what I have been doing for the past year or so - very 
painful experience, though once done it works for good (well, most of 
the time!). I am also strongly against using STUN as, for me, this is an 
abomination and should never EVER be used.

> <mounts soapbox>
> The real answer is to persuade the world and his dog that NAT == 
> Broken. By definition, NAT breaks rule 1 of IP connectivity that 
> requires every device to have a globally unique and routeable address.
> If only as much effort was put into making IPv6 as ubiquitous as IPv4 
> as is put into trying to work round (eg writing ALGs to put into NAT 
> gateways) the fundamental breakage of NAT then I think IPv6 would be 
> a lot further on than it is.
>   
OK, I have a confession to make - when I first looked at your post, it 
reminded me of something, but I couldn't put my finger on it until I 
came across the above paragraph and then I remembered - when I started 
looking over the web for more info about the above two modules I read a 
thread (I think it was in one of the Shorewall mailing lists from a 
while ago) containing a rather well-thought-out well-drilled rant by 
somebody (it might have been you, actually, in which case hats off to 
you, sir!) about SIP/NAT and the like - it made me laugh out loud 
because every single word of that rant was 100% true! Pure genius!

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