[OpenSIPS-Users] PRACK interworking requirements

[Giovanni Maruzzelli]

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
>
>
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