[cisco-voip] ATA 186 behind NAT box - Serious Limitation

[Andrew Croch]

I have been trying to setup an ATA 186 behind a NAT box to connect to a 
Gatekeeper but it never worked fully.
I have also been working with a cirilium gatekeeper and I get the same 
problem. The ATA working behind a NAT box in the H323 configuration fails in 
the RAS process.
The RAS meassages that are coming back from the GK to the ATA are lost and 
never get to the destination. This happens once the IP inside the RAS 
payload is an internal IP of the ATA (a local LAN IP) and not the public IP 
provided by the NAT box.

Does anybody knows if it is possible to change the configuration of the ATAs 
to send the correct IP in the Payload ?
This is a serious limitation of the ATA.

Thanks

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