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

[Anthony Kouloglou]

  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?
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net <mailto:cisco-voip at puck.nether.net>
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20110203/25f87eb6/attachment.html>