[OpenSIPS-Devel] [OpenSIPS-Users] [RFC] NAT pinging

[Dan Pascu]

On Thursday 11 December 2008, Bogdan-Andrei Iancu wrote:
> Hi,
>
> I was evaluating an implementation for NAT pinging also via TCP
> connection, but I just diging in the current pinging "logic" I found
> some issues that needs to be sorted out first.
>
> B) PATH extension
>
> First of all if PATH is used and simply UDP ping is used, nathelper
> pings the source of the REGISTER (where it came from).
> Question: does this make sense? as anyhow the INVITEs will be sent to
> the top PATH uri....

In the nat_traversal module the border proxy (the one that receives the 
REGISTER directly from the phone) will do the pinging, so it doesn't 
matter if you use the path extension or not. This will not only avoid the 
need to have code that handles the path extension case in a particular 
way, but it also avoids unnecessary traffic along the proxies in the 
path. Only the border proxy will send pings to the device directly.

-- 
Dan