[asterisk-users] Asterisk 12 and RFC4662 (Resource Lists)

[Joshua Colp]

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