asterisk users - Jan 2004 - Excternip and FWD

Hi

I have updated from CVS about a week ago  and got the externip working 
with FWD for outbound calls., but I'm having problems with inbound 
calls, I don't think they are even reaching the Asterisk box even though 
I have forwaorded 5060 and the rtp range specified, another thing I have 
notice, is that very ocasionally when I m using sip debug the internal 
IP is used for communication with FWD,  Has anyone got inbound calls 
working with FWD and Externip through a Nat?

Robb