[OpenSIPS-Users] PRACK interworking requirements

[Bogdan-Andrei Iancu]

Thanks Antonios for sharing the links - give me a bit of time to dig 
into and extract some info; to be honest I find such docs quite useful 
as they provide real life examples - the best you can get in order to 
understand how it should work.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
   https://www.siphub.com

On 25.11.2025 18:10, Antonios Psaras wrote:
>
> Hello Team
>
> In most cases PRACK is needed for early audio services like Malicious 
> Call Announcement. In those case the presence of 100rel and UPDATE is 
> required. As this is a very well known issue and has already been 
> implemented to few SBC Vendors, I suggest to check the documentation 
> of such feature and implement something similar.
>
> Here are two links for PRACK Interworking 
> <https://docs.oracle.com/en/industries/communications/session-border-controller/9.1.0/configuration/sip-prack-interworking.html#GUID-DF953FC6-35D0-4C8B-8812-3D7E72F7795E>and 
> UPDATE Interworking 
> <https://docs.oracle.com/en/industries/communications/session-border-controller/9.1.0/configuration/update-interworking.html#GUID-17824ABA-36FE-4E50-A6EB-F3BADEA9767E>
>
> As these features are prerequisite for a project we are involved, we 
> are willing to contribute in any way to speed up the process.
>
> Regards
>
> **
>
> *Antonis Psaras*
>
> *From:* Users <users-bounces at lists.opensips.org> *On Behalf Of 
> *Giovanni Maruzzelli
> *Sent:* Τρίτη, 25 Νοεμβρίου 2025 13:14
> *To:* Bogdan-Andrei Iancu <bogdan at opensips.org>
> *Cc:* Giovanni Maruzzelli <gmaruzz at opentelecom.it>; OpenSIPS users 
> mailling list <users at lists.opensips.org>
> *Subject:* Re: [OpenSIPS-Users] PRACK interworking requirements
>
> On Tue, Nov 25, 2025, 11:57 Bogdan-Andrei Iancu <bogdan at opensips.org> 
> wrote:
>
>
>     The result here should be a dlg dedicated function to generate a
>     PRACK from the onreply_route, like "dlg_answer_with_prack()" kind
>     of function? or should we look into a more automatic approach,
>     like flagging the dialog at creation to automatically generate the
>     PRACK upon replies flagged with so?
>
> personally I'm a control freak and would like better an explicit 
> function, maybe even with parameters to modify things if needed :))
>
> -giovanni
>
>
>     Regards,
>
>     Bogdan-Andrei Iancu
>
>     OpenSIPS Founder and Developer
>
>        https://www.opensips-solutions.com
>
>        https://www.siphub.com
>
>     On 25.11.2025 11:46, Giovanni Maruzzelli wrote:
>
>         hello OpenSIPSers,
>
>         in previous mails has been noticed that various ITSPs are
>         starting to require PRACK support.
>
>         We know that PRACK belongs to endpoints, specifically phones
>         and B2BUAs.
>
>         But...
>
>         There can be a use case where OpenSIPS will work as SBC (not
>         necessarily using the b2b module)
>
>         So, we can have a case where we would like to support that the
>         dialogue module insert the 100rel in the Supported: INVITE's
>         header, and manage to send a PRACK method to acknowledge
>         provisional responses
>
>         If and when 100rel/PRACK are "generated" by OpenSIPS, they
>         will be filtered out (not propagated) to/from the endpoints,
>         even if the endpoint would like to support it
>
>         Reference RFC: https://www.ietf.org/rfc/rfc3262.txt
>
>         I believe this will be enough to make ITSPs happy.
>
>         Further developments can be moved to future.
>
>         Would be very very nice to have this feature backported to
>         OpenSIPS 3.6, being it the last of the 3.X series, and an LTS
>
>         Please let's gather here your thoughts , requests, corrections
>         and observations on this issue.
>
>         Have a nice Monday you all!
>
>         -giovanni
>
>         -- 
>
>         Sincerely,
>
>         Giovanni Maruzzelli
>         OpenTelecom.IT
>         cell: +39 347 266 56 18
>
>         _______________________________________________
>
>         Users mailing list
>
>         Users at lists.opensips.org
>
>         http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
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