[OpenSIPS-Users] 100rel / PRACK Interworking

[Johan De Clercq]

+1.  I totally agree with you.
It really is a mess, to me it seems that IMS guys are scared of rtp.

Op vr 14 nov 2025 om 10:03 schreef Walter Schober <walter.schober at neotel.at
>:

> Hi!
>
>
>
> I also want to point out that its not done with PRACK handling alone.
> Followup (multiple) UPDATE with codec changes must be handled, too.
> Sometimes that lead into AMR(WB)/PCMA/G722/OPUS transcoding in early state.
> Including all the DTMF PT issues.
>
> It is definitely a endpoint / softswitch feature.
>
>
>
> I know those ignorant IMS guys pushing out their internal mess to plain
> RFC3261 interconnects and forcing tasks previously done by an MSC to the
> rest of the world.
>
>
>
> Br
>
> Walter
>
>
>
> *Von:* Users <users-bounces at lists.opensips.org> *Im Auftrag von *Johan De
> Clercq
> *Gesendet:* Donnerstag, 13. November 2025 16:29
> *An:* gmaruzz at opentelecom.it; OpenSIPS users mailling list <
> users at lists.opensips.org>
> *Betreff:* Re: [OpenSIPS-Users] 100rel / PRACK Interworking
>
>
>
> Giovanni on a side note, what to do with update ? do you handle it locally
> or do you forward it to your endpoint ?
>
>
>
> BR, Johan.
>
>
>
> Op do 13 nov 2025 om 15:54 schreef Giovanni Maruzzelli <gmaruzz at gmail.com
> >:
>
> Antonio, you may want to update this feature request from Johan:
> https://github.com/OpenSIPS/opensips/issues/2076
>
>
>
> On Thu, Nov 13, 2025 at 3:48 PM Antonios Psaras <apsaras at microbase.gr>
> wrote:
>
> Hello Giovanni
>
>
>
> I totally agree with you. PRACK is an endpoint feature. But as you know,
> working with IMS, and having all kind or end point implementations of sip
> stack you need to do the dirty job in the middle for interoperability
> reasons. Commercial SBC have that feature called 100rel Interworking which
> can be enabled per Trunk. Hence, if a carrier requires 100rel/PRACK
> enforcement and the end point does not supporting it, the function is
> engaged and handles the PRACK locally.
>
>
>
> I will check Bogdan suggestion but in the first read looks like a tmp work
> around which I am not sure if that can be scaled to few hundreds of CPS
> that we work with.
>
>
>
> As this is a feature that will be needed for VoLTE/5G/IMS networks my
> suggestion is to create a module for that.
>
>
>
> Regards
>
>
>
>
>
> *From:* Giovanni Maruzzelli <gmaruzz at gmail.com>
> *Sent:* Πέμπτη, 13 Νοεμβρίου 2025 16:37
> *To:* apsaras at microbase.gr; OpenSIPS users mailling list <
> users at lists.opensips.org>
> *Subject:* Re: [OpenSIPS-Users] 100rel / PRACK Interworking
>
>
>
>
>
>
>
> El 26/02/2024 a las 7:43 a. m., Bogdan-Andrei Iancu escribió:
>
> >* yes, you can use the b2b_logic (together with b2b_entities) for that, *
>
> >* but it may be a too heavy tool for the purpose. Maybe you can try to *
>
> >* generate the PRACK from OpenSIPS level by using the t_uac_dlg MI *
>
> >* function [1] via the mi_script module [2] - basically to trigger that *
>
> >* MI cmd from the onreply_route, when receiving the 180 reply.*
>
> >
>
> >* [1] https://opensips.org/html/docs/modules/3.4.x/tm.html#mi_t_uac_dlg <https://opensips.org/html/docs/modules/3.4.x/tm.html#mi_t_uac_dlg>*
>
> >* [2] https://opensips.org/html/docs/modules/3.4.x/mi_script.html#afunc_mi <https://opensips.org/html/docs/modules/3.4.x/mi_script.html#afunc_mi> *
>
>
>
>
>
>
>
> On Thu, Nov 13, 2025 at 3:34 PM Giovanni Maruzzelli <gmaruzz at gmail.com>
> wrote:
>
>
>
>
>
> eg: https://lists.opensips.org/pipermail/users/2024-March/047880.html
>
>
>
>
>
>
>
> On Thu, Nov 13, 2025 at 3:27 PM Giovanni Maruzzelli <gmaruzz at gmail.com>
> wrote:
>
> Hello Antonio,
>
>
>
> PRACK is actually an endpoint feature, at the proxy level you can only
> fake it...
>
>
>
> -giovanni
>
>
>
> On Thu, Nov 13, 2025 at 3:14 PM Antonios Psaras <apsaras at microbase.gr>
> wrote:
>
> Dear Team
>
>
>
> As many carriers requires 100rel for interoperability reason with IMS, the
> need for 100rel interworking is mandatory. Is there any solution available
> to implement that on OpenSIPs Proxy level?
>
>
>
> Regards
>
>
>
> Antonis Psaras
>
>
>
>
>
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>
>
>
> --
>
> Sincerely,
>
> Giovanni Maruzzelli
> OpenTelecom.IT
> cell: +39 347 266 56 18
>
>
>
>
> --
>
> Sincerely,
>
> Giovanni Maruzzelli
> OpenTelecom.IT
> cell: +39 347 266 56 18
>
>
>
>
> --
>
> Sincerely,
>
> Giovanni Maruzzelli
> OpenTelecom.IT
> cell: +39 347 266 56 18
>
>
>
>
> --
>
> Sincerely,
>
> Giovanni Maruzzelli
> OpenTelecom.IT
> cell: +39 347 266 56 18
>
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