[OpenSIPS-Users] Push Notification without registration timers

Callum Guy callum.guy at x-on.co.uk
Mon Feb 15 17:08:49 EST 2021

Quick update, since sending my post I have made a small amount of
progress using event_routing.

My prototype is currently doing the following:

- INVITE arrives targeting unregistered device
- Execute launch(rest_post()) to initiate the notification in another process
- Execute async( wait_for_event("E_UL_AOR_INSERT", "aor=UA at DOM", 10),
- (request exits)
- RESUME_ON_REG called when registration arrives
- send provisional reply
- lookup() (ignoring any advice that the user isn't ready without another PN!)
- t_relay() to forward the INVITE to the new registration

This feels like a workable solution although there is some scope for a
race condition as I'd like to book the event waiter before sending the
POST request however I'm not sure that's possible?

I'm hopeful that I can progress and solve the remaining issues shortly..

Happy SIPing all.

On Mon, 15 Feb 2021 at 15:42, Callum Guy <callum.guy at x-on.co.uk> wrote:
> Hi All,
> Running 3.1 release.
> I'm trying to implement a proxy which *only* supports PN-enabled
> devices however I'm running into some implementation issues for my use
> case.
> My project is targeting a very low usage subscriber base (users may be
> idle for months) so I'd like to disable the timer based registration
> refresh and simply collect the PNID at time of registration for later
> use. I don't want to lose devices (which may be turned off) through
> contact purging when they don't respond to PN refresh requests. Is
> this possible? If not I'm happy to manually implement an external
> system for tracking PNID to subscriber relationships if that is
> necessary/simpler. Crucially I want to preserve a list of all the
> PNID's associated with a subscriber (i.e. a user with multiple
> devices) for a long time.
> The main problem I am running into is transaction parking without
> using the default module implementation. If the location table does
> not contain contact information for these devices I can't use the
> default park/resume features provided by the registrar module even
> though I can load PRID's from another source. At the point of dial I
> want to park the INVITE and dispatch all the notifications however I
> get the impression that these features are under the hood. Is this
> possible at the script level without the magic behind the registrar
> lookup() method or pn_process_purr()?
> Furthermore this project runs on a private network so I'm not sure its
> strictly necessary to generate and track PURR values for active
> sessions, is there any reason I can't just store the PRID against the
> dialog and use that to generate PN mid-dialog? Every call passing
> through this proxy will be for PN-enabled devices so this seems like a
> reasonable implementation even if it doesn't conform to RFC 8599?
> Thanks,
> Callum


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