[Users] NATHelper module - need some explanation

Daniel-Constantin Mierla daniel at voice-system.ro
Thu Mar 30 16:11:39 CEST 2006


Hello,

On 03/28/06 19:28, Christophe Irles wrote:
>
> 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 ?
>
The server where UA2 is registered has to take care of NAT traversal for 
UA2, since it is the only one which can send packets behind the NAT to 
reach UA2.

Cheers,
Daniel

> What about NAT pinging and the "NAT binding keep alive" features in 
> this case ?
>
> Thanks in advance,
> Christophe
>
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