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 <[email protected]> Sent: Πέμπτη, 13 Νοεμβρίου 2025 16:37 To: [email protected]; OpenSIPS users mailling list <[email protected]> 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 > [2] 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 <[email protected] <mailto:[email protected]> > wrote: eg: https://lists.opensips.org/pipermail/users/2024-March/047880.html On Thu, Nov 13, 2025 at 3:27 PM Giovanni Maruzzelli <[email protected] <mailto:[email protected]> > 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 <[email protected] <mailto:[email protected]> > 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 [email protected] <mailto:[email protected]> 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
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