separate stun servers needed?
 

I have two ATA device behind my fullcone nat router. So I assign two sip ports for avoiding conflicts.

I have also activated STUN discovery and hole punching. However, on one occasion I notice when I try to call one ATA to the other within the same LAN, I got one way traffic on one. The other device seems to send packets over but not receiving.

I have specified the SAME stun server for both ATA's. I wonder if I should actually input different stun servers for each to avoid problems as such.

I could make this to work with outbound proxy but if possible I like to avoid a solution based on proxy.

What for?
Do you have any issue when STUN is not used at all?

sorry but i gave one wrong info... it is not a full cone router but a restricted cone router.