On Mon, Oct 03, 2016 at 12:22:22PM +0300, Yasin CANER wrote:
>     When i have a look ietf3261 , i couldnt find any thing this flow. Do you
> have any idea about it?
>     
> I am looking forward to your suggestions.

It is simple, never trust the endpoint and always assume there is NAT or
a statefull firewall between the endpoint and your sip server. So always
send keepalives. 

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