[SIPForum-techwg] NAT Traversal

[Spencer Dawkins]

Hi, John,

...

> So it seems there needs to be some negotiation before this can be used,
> and if the enterprise media endpoint doesn't support it, you would have
> to use a different technique. Alternatively all media could be funnelled
> through a media proxy on the enterprise side, which ensures the
> necessary functionality is provided, but then that entity might as well
> do the SDP modification too. In other words, what an SBC would do.
>
> I would have concerns about how this would work in more complex
> situations, e.g., a call from a service provider to an enterprise, which
> then gets forwarded to a destination via another service provider,
> thereby traversing two NATs, one on entry to the enterprise and one on
> exit.

Just so I'm clear - would you have any concerns about ICE in this complex 
situation?

Thanks,

Spencer