[cisco-voip] cisco 2801 as SIP-UAC is behind NAT

[Ryan Ratliff]

That's the general idea with protocol aware fixup and NAT.

-Ryan

On Feb 3, 2011, at 11:43 AM, Anthony Kouloglou wrote:

Thanks Ryan,
so i leave the cisco router using as source IP address the private one and the other gateway that does the NAT, has to be aware of SIP protocol;
then, it will change the source ip in the sip message that the voice gateway sends to the ISP from the private to the real one.
it is so?

On 3/2/2011 18:34, Ryan Ratliff wrote:
> 
> Your device doing the NAT needs to support SIP fixup so it modifies the internal IP to the external one inside the SIP messages.      
> 
> -Ryan
> 
> On Feb 3, 2011, at 10:29 AM, Anthony Kouloglou wrote:
> 
>     Hi, 
> i have a 2801 and i am trying to register it with a SIP ITSP that requires  proxy authentication.
> Unfortunately, router is connected with it's fa0/0 to the internet and has a private IP.
> This IP is full NATted on another router that connects it to the internet.
> I have managed to get it registered but the local ip is always the private one.
> How can i change this so that the ITSP manages to reach me?
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