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

[Ryan Ratliff]

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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