[OpenSIPS-Users] 100rel / PRACK Interworking

[Bogdan-Andrei Iancu]

Hi Giovanni, Johan, Antonios,

Talking about the PRACK, yes, it sounds like a good idea to get such 
support in the dialog module. And yes, we need to start with drafting 
the functionality to be provided - should we do this over the #2076 
github ticket (mentioned by Giovanni) or open new thread here, backed-up 
by a GH wiki page to aggregate the requirements ?

Best regards,

Bogdan-Andrei Iancu

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

On 14.11.2025 11:30, Giovanni Maruzzelli wrote:
> > 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
>
>
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