Russell,

Maybe I was not clear when I listed my NAT entries. My ATA uses 16384-16482 for both incoming and outgoing calls. It just increases by 4 after each call to get the next port number and cycles through the range again. I think this port number is communicated through the SIP packets. The adapter probably finds out the translated port number using STUN server if its used. I don't know a lot about how its communicated to the media gateway. The translated port number on the public side could be different depending on the router.