[Serusers] presence_b2b UA

[Vaclav Kubart]

Hi Curt,
are presence subscriptions enough? PA module is prepared to generate
internal (QSA) subscription when it is processing SUBSCRIBE request. But
it still can not handle responses - this will be done soon. I think that
this will be what do you need.

I hope that I will have time for it and finish it till the end of
August.

	Vaclav

On Wed, Aug 09, 2006 at 02:18:07PM -0500, Curt Moore wrote:
> Hi Vaclav.
> 
> Thank you for your reply.
> 
> This sounds very close to what I'm trying to accomplish for presence.
> I have 1 SER server setup as the main proxy/registrar.  If a SUBSCRIBE
> message comes into this server, it is forwarded over to a second SER
> server which maintains the watcher info, a presence server. This
> currently works perfectly.
> 
> What I'd like to happen is for the B2B UA on the presence server to
> generate a new SUBSCRIBE message and send it out to an Asterisk
> server, essentially having the SER presence server subscribe to the
> presence of the SIP user on the Asterisk server.  If the presence
> changes on the Asterisk server, it will send a NOTIFY back to the
> presence SER server.  This should then, as you mention, trigger a
> notification through QSA back to any watchers watching this particuar
> resource.
> 
> My confusion is how to get the outbound SUBSCRIBE generated through
> QSA and sent to the Asterisk server from the presence server after the
> initial inbound SUBSCRIBE comes into the SER presence server.
> 
> How would I get the SER server to generate the outbound SUBSCRIBE?
> 
> Thanks!
> -Curt
> 
> On 8/9/06, Vaclav Kubart <vaclav.kubart at iptel.org> wrote:
> >Hi,
> >presence_b2b processes INTERNAL subscriptions (through QSA - internal
> >API for status querying) and generates SIP subscriptions according to
> >them (now only presence subscriptions). Each arriving NOTIFY triggers
> >notification through QSA.
> >
> >It works quite good with one SER as resource list server and another as
> >presence server.
> >
> >        Vaclav
> >
> >On Wed, Aug 09, 2006 at 12:01:59PM -0500, Curt Moore wrote:
> >> Hello all.
> >>
> >> I have been experimenting with the ser-0.10.99-xxx branch(es) and have
> >> a question about the presence_b2b module.
> >>
> >> I realize that the module is not yet fully complete but according to
> >> the documentation, when finished, the module should be able to take an
> >> inbound SUBSCRIBE request and then create a new SUBSCRIBE request
> >> outbound to another SIP entity or multiple SIP entities, ie Asterisk
> >> servers, hence the back to back functionality.  What is the status of
> >> this functionality?  Is anyone currently working to complete this
> >> functionality?  I would be interested in helping complete or
> >> sponsoring the completion of this functionality.
> >>
> >> My intent is to have a SER server act as the central watcher database
> >> server and have all SUBSCRIBE and NOTIFY requests channeled through
> >> this SER server.  This SER server will then generate new SUBSCRIBE
> >> requests out to each server in a farm of Asterisk servers and the
> >> Asterisk servers will then send NOTIFIES back to the SER watcher
> >> server.  The watcher server will then take care of sending the NOTIFY
> >> messages to the correct watcher(s), according to the data in its
> >> watcher database.
> >>
> >> Is anyone currently doing anything similar to this using a different
> >> method or is using the yet to be completed B2B UA the correct/only way
> >> to accomplish this?
> >>
> >> Thanks,
> >> -Curt
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> >