[Serusers] PSTN GW - No NAT

[Klaus Darilion]

If both parties (GW and SIP client) are not behind NAT (public IP, no
firewall), you do not need nathelper+rtpproxy. Even in the case of a
client behind NAT and the GW with public IP you do not need rtpproxy if
the GW supports symmetric RTP (like Cisco GW does).

regards,
klaus

support wrote:

> Hi,
>  
> I have tested ser with a T1 trunk GW not behind NAT, but using fixed IP. 
> I then disable the use of rtpproxy and nathelper. However, when I use 
> PSTN call to a SIP UA, only ringtones could be heard but no voice 
> passing through it.
>  
>  
> Does it mean that rtpproxy + nathelper must be used even in the case 
> when UA and PSTN GW are not behind NAT/Firewall?
>  
>  
> Thomas
> 
> 
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