Juha Heinanen wrote:
> Christer Holmberg writes:
> 
>  > The UA *CAN* send double CRLF, but the problem is that the edge proxy
>  > doesn't know whether the UA is going to do it, so it may provide
>  > short registration refreshes also for TCP connections.
> 
> christer,
> 
> this directly contradicts what you supported earlier today, i.e., that
> the responsibility to handle nat is in the ua.  proxy NEVER needs to
> "provide" anything for tcp ua's nat problem.  as i wrote already, if tcp
> ua is behind nat it simply sends CRLFs or (if it is not able to send
> CRLFs) uses short enough registration interval.

Absolutely -- that's the most elegant way of doing things which takes no 
support in server, no negotiation protocol, and is placed where it 
belongs, in the client.

I think specific action items that can be taken are:
- TCP-keep-alive as described above
- UDP-keep-alive taking some answer

Both IMO best placed in BEHAVE for reuse by other apps.

-jiri

> 
> -- juha
> 
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