On 10/06/2011 3:49 AM, Daniel-Constantin Mierla wrote:
..deleted
Ok. But this happens when I start my application, so it does not
know anything about the contacts, and it receives empty body. So,
even after this notify, it still does not know anything about that
contact, is that right?
Any application (or those I used so far), they show the contacts
offline at startup, this is the initial state. Kamailio notifies with
presence states when there is a PUBLISH by the presentity. The
notification with the empty body give the state of the subscription,
not the state of contact -- see the subscription-state header in notify.
Also, as the user is offline (not connected since long time ago), why
then kamailio sends an empty body for him instead of sending Offline
status? This would allow the application to correctly show him as
offline, instead of "nothing known". I noticed that even after
several minutes no Offline status is sent by kamailio.
The sip presence server sends in notify only the presence documents
published by a user agent. If there is no such document, the sip
server has nothing to send. I think there are some specs that allow a
user to set default state, probably via xcap -- but I am not sure and
I haven't searched ietf for it.
I agree that an application should assume a contact is offline at the
time of the initial SUBSCRIBE. Any subsequent NOTIFYs will modify that
status.
If an empty NOTIFY is send as the first NOTIFY after a SUBSCRIBE, then
this means the server has no presence document for the subscribed
entity. This will occur when when entity is offline.
If the entity is online, then the first NOTIFY may still be empty, but
there should be a subsequent NOTIFY containing the current presence
document.
Hopefully, this second NOTIFY is sent as soon as possible after the
SUBSCRIBE, and is not deferrred to when the second party refreshes it's
presence document, which could be minutes or even hours later (depending
on the presence timeout)
Daniel - can you confirn this?
Craig
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Craig Southeren Post Increment – VoIP Consulting and Software
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"Science is the poetry of reality." Richard Dawkins
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