Hi,

In this network topology:
[UA 1]---[(open)SER+FW/NAT]---[internet]---[FW/NAT]---[UA 2]

UA 1 can call UA 2 (and the opposite) since NATHelper has changed header (Contact, SDP, …) AND UA 2 is registered on the same (open)SER

Now if UA 2 is registered on another server, is the NATHelper still working efficiently ?
What about NAT pinging and the "NAT binding keep alive" features in this case ?

Thanks in advance,
Christophe