[SR-Users] Meaning of empty body in NOTIFY

[Daniel-Constantin Mierla]

On 6/10/11 8:49 PM, Craig Southeren wrote:
> On 10/06/2011 11:20 AM, Daniel-Constantin Mierla wrote:
>
> ...deleted
>>> Thank you so far for your explanations.
>>
>> have you spotted in SIP/SIMPLE specs what has to be sent when the 
>> presentity is offline? My quick google was not that succesful. Maybe 
>> Inaki has the specs more fresh indexed in memory and can help.
>>
>> I based my assumption that the sip/simple presence server should not 
>> generate itself a presence/pidf document with status closed/offline 
>> since the pidf has a <tuple id="..."> node that is generated by 
>> presentity device.
>
> I know there is an XCAP verb to do this.
>
> Also, you might like to look at "RFC 4481 - Timed Presence Extensions 
> to the Presence Information Data Format". This allows a client to 
> specify status for a future time period when other status may not be 
> available.
>
> Specifically, the RFC says:
>
>   "During composition, a presence agent (PA) may encounter a stored 
> <timed-status> element that covers the present time.  The PA MAY 
> either discard that element or MAY
>    convert it to a regular <status> element if it considers that 
> information more credible."
>
> So, if a client uploads a presence document that contains a 
> <timed-status> element, that element could be sent by the PA when the 
> client goes offline, rather than the entire document being discarded 
> (which is what I suspect is happening now).
we don't have this rfc implemented in kamailio at this time. Is any UA 
you know doing this kind of thing?

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda