[OpenSIPS-Users] 100rel / PRACK Interworking

Fri Nov 14 09:52:13 UTC 2025

open question :  is there support for OPUS, AMR, AMR NB, AMR WB, EVS ?
these hd coders are becoming hot in Europe.

Op vr 14 nov 2025 om 10:33 schreef Giovanni Maruzzelli <gmaruzz at gmail.com>:

> > It really is a mess, to me it seems that IMS guys are scared of rtp
> +1 it is an endpoint thing, trunk providers are wrong to ask for it (what
> do they get from it?)
>
> when you (trunk provider) know that the phone is actually ringing, what do
> you gain? It has meaning when you control the whole chain, end-to-end
> (carriers, IMS) not at all for
> deskphone->itsp->trunk->whatever->carrier->endphone
>
> But I know they (trunk providers) start to *REQUIRE* PRACK
>
> So, probably a module, or an extension of an existing module, can be
> warranted and welcome
>
> Possibly on 3.6.X (that's the last LTS of the 3.0.0 series)
>
> Let's open a thread on what functionalities can be useful in it?
>
> -giovanni
>
>
> On Fri, Nov 14, 2025 at 10:21 AM Johan De Clercq <Johan at democon.be> wrote:
>
>> +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
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>>>
>>>
>>>
>>> --
>>>
>>> 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
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>
>
> --
> 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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