[asterisk-users] Adding Subscribe Handlers in PJSIP

Olivier oza.4h07 at gmail.com
Tue Jan 15 07:12:07 CST 2019

Hi all,

Is there a way with Polycom phones or alternatives, to configure a specific
SIP server for such as-feature-event or call-info events ?
If positive, maybe a third party SIP server (Kamailio, ...) supporting
those events would allow such implementation.

Looking at Yealink phone Admin guide, it seems possible to set a Yealink
phone to handle such event Notify/Subscribe communicating with a dedicated
SIP server.
It seems rather "expensive" though.

Thoughts ?

Best regards

Le mer. 1 mars 2017 à 21:21, Joshua Colp <jcolp at digium.com> a écrit :

> On Wed, Mar 1, 2017, at 04:02 PM, Trey Hilyard wrote:
> > Is there any "easy" way to add a custom subscribe handler? I have a set
> > of
> > users with Polycom phones that attempt to Events that Asterisk/PJSIP
> > doesn't recognize, "call-info" and "as-feature-event". It just generates
> > a
> > warning, but it got me wondering if I could add my own handlers for those
> > that didn't actually do anything but simply responded with a 200 OK.
> >
> > Yes, I can probably stop the phones from subscribing, but this is more
> > academic at this point. I assume there are things that I could do if I
> > wanted to make changes and recompile, but is there an easier way to add a
> > handler? I am a little confused about whether there is a subscribe
> > handler
> > in front of res_pjsip_pubsub, or if that is the first place that a
> > SUBSCRIBE could get caught.
> The res_pjsip_pubsub module itself provides a framework for registering
> support for event types (ast_sip_register_subscription_handler) and
> handles the subscription lifetime. Callbacks are invoked on the various
> things. Subscription requested, terminated, etc. There are also
> functions for sending a NOTIFY and such.
> There's also another framework for handling PUBLISH.
> This all does require writing a C module though and building it with
> Asterisk. There's no external mechanism to implement such things.
> --
> Joshua Colp
> Digium, Inc. | Senior Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - US
> Check us out at: www.digium.com & www.asterisk.org
> --
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