[OpenSIPS-Users] NOTIFY nat_keepalive - Bad Event

[Bogdan-Andrei Iancu]

yes, form strict practical point of view, you are right here.

Regards,
Bogdan

Dan Pascu wrote:
> On Monday 02 March 2009, Bogdan-Andrei Iancu wrote:
>   
>>>> Anyhow, as best practice , the OPTIONS method is more appropriate
>>>> for nat pinging.
>>>>         
>>> I have to disagree. OPTIONS generate 2-3 times more traffic because
>>> of the bigger replies. OTOH, it doesn't really matter if we get a 200
>>> OK or a negative reply to such a keep-alive request, does it? All it
>>> matters is that the device behind NAT sends something (anything) to
>>> keep the NAT open from inside. NOTIFY gets the job done with less
>>> traffic, which makes it better.
>>>       
>> Indeed, the OPTIONS may generate more traffic (depends on the
>> implementation - kphone sends with SDP also, other not). But when comes
>> to interoperability, OPTIONS is more accepted by end devices, rather
>> then NOTIFY (where the phone must implement the method and the event).
>>     
>
> I don't think the phone needs to implement or for that matter even be 
> aware of the NOTIFY method. Any device should reply with a "not 
> implemented" or "method not understood" negative reply to any method it 
> doesn't support. Any reply will do for the purpose of keepalive, be it 
> positive or negative. In practice I have not encountered any device that 
> would not reply to a keep-alive NOTIFY.
>
>