[OpenSIPS-Users] PRACK interworking requirements

Wed Nov 26 08:32:10 UTC 2025

 Update support would also be handy. For ease of use there should be update
to reinvite (update is a massive problem).
as you like the oracle documents, here is a link
https://docs.oracle.com/cd/E95618_01/html/sbc_scz810_acliconfiguration/GUID-17824ABA-36FE-4E50-A6EB-F3BADEA9767E.htm
.

I implement this feature everywhere.

-Johan.

Verzonden vanuit Outlook voor iOS <https://aka.ms/o0ukef>
------------------------------
*Van:* Users <users-bounces at lists.opensips.org> namens Bogdan-Andrei Iancu <
bogdan at opensips.org>
*Verzonden:* Wednesday, November 26, 2025 8:59:10 AM
*Aan:* OpenSIPS users mailling list <users at lists.opensips.org>; Vlad Paiu <
vladpaiu at opensips.org>
*Onderwerp:* Re: [OpenSIPS-Users] PRACK interworking requirements

Hey Vlad,

Yeah, the function is a good starting point, but maybe for internal usage,
either with a wrapper on top or in an auto mode, in order to take care of
all 100rel specifics.

Regards,

Bogdan-Andrei Iancu

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

On 25.11.2025 18:23, Vlad Paiu wrote:

note that we currently have
https://opensips.org/html/docs/modules/3.6.x/dialog.html#func_dlg_send_sequential
, it can be used to generate a PRACK ( you'll have to manually add the Rseq
header), but it's not working properly if the upstream has multiple TO-TAGS
that are ringing ( it will always generate to the newest learnt to-tag, and
there's also some quirks with CSEQ mapping ), so perhaps the 'manual'
approach would be getting dlg_send_sequential to work properly for
generating early requests ( with PRACK being a rather specific use-case due
to it's cseq/rseq stuff )
On 11/25/25 13:14, Giovanni Maruzzelli wrote:

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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