asterisk users - Oct 2013 - Asterisk 12 and RFC4662 (Resource Lists)

Hi,

Many SIP phones implement list-based Notify-Subscribe mechanism with the
phone may request to be notified of status changes from a whole list of
resources.

Thanks to PJSIP inclusion in Asterisk 12, I'm wondering how a Resource List
Server could be implemented with Asterisk 12.

1. I couldn't see RFC4662 itself is implemented in PJSIP. Is this correct ?

2. Which architecture regarding resource lists would best match Asterisk
current and future feature set ?
A. In internal Asterisk feature ?
B. An external application which would subscribe to each individual
resource on one hand, and would serve list-based requests on the other hand
?
C. Something else ?

3. Has someone already dealt with list-based Notify-Subscribes outside
Asterisk scope ? How would you then qualify this experiment ?

Regards
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On Wed, Oct 16, 2013 at 1:25 AM, Olivier <oza_4h07 at yahoo.fr>
wrote:
> Hi,
>
> Many SIP phones implement list-based Notify-Subscribe mechanism with the
> phone may request to be notified of status changes from a whole list of
> resources.
>
> Thanks to PJSIP inclusion in Asterisk 12, I'm wondering how a Resource
List
> Server could be implemented with Asterisk 12.
>
> 1. I couldn't see RFC4662 itself is implemented in PJSIP. Is this
correct ?
>
> 2. Which architecture regarding resource lists would best match Asterisk
> current and future feature set ?
> A. In internal Asterisk feature ?
> B. An external application which would subscribe to each individual
resource
> on one hand, and would serve list-based requests on the other hand ?
> C. Something else ?
>
> 3. Has someone already dealt with list-based Notify-Subscribes outside
> Asterisk scope ? How would you then qualify this experiment ?
Being that Asterisk 12 is still in beta and not widely used by the
user-base yet, you may want to ask this on the asterisk-dev list.
Those working on Asterisk 12 features may have more insight,
especially since the scope of your question covers Asterisk internals
(2.A)

-- 
Rusty Newton
Digium, Inc. | Community Support Manager
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
direct: +1 256 428 6200

Check us out at: http://digium.com & http://asterisk.org

Olivier wrote:
> Hi,
Hola,
> Many SIP phones implement list-based Notify-Subscribe mechanism with the
> phone may request to be notified of status changes from a whole list of
> resources.
>
> Thanks to PJSIP inclusion in Asterisk 12, I'm wondering how a Resource
> List Server could be implemented with Asterisk 12.
>
> 1. I couldn't see RFC4662 itself is implemented in PJSIP. Is this
correct ?
Correct. The only thing it would implement is the mechanism to construct 
the messages, which is a very minor part. The actual logic is the hard part.
> 2. Which architecture regarding resource lists would best match Asterisk
> current and future feature set ?
> A. In internal Asterisk feature ?
> B. An external application which would subscribe to each individual
> resource on one hand, and would serve list-based requests on the other
> hand ?
> C. Something else ?
I don't think anyone has really scoped this out. Previously due to 
chan_sip it was just very invasive and infeasible to create such a 
thing, but due to the modular design of chan_pjsip it's much closer to 
reality. What it actually MEANS and what it would look like though... 
requires thought.
> 3. Has someone already dealt with list-based Notify-Subscribes outside
> Asterisk scope ? How would you then qualify this experiment ?
I've got nothin' here.

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at:  www.digium.com  & www.asterisk.org