Thanks Antonios for sharing the links - give me a bit of time to dig
into and extract some info; to be honest I find such docs quite useful
as they provide real life examples - the best you can get in order to
understand how it should work.
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
https://www.opensips-solutions.com
https://www.siphub.com
On 25.11.2025 18:10, Antonios Psaras wrote:
Hello Team
In most cases PRACK is needed for early audio services like Malicious
Call Announcement. In those case the presence of 100rel and UPDATE is
required. As this is a very well known issue and has already been
implemented to few SBC Vendors, I suggest to check the documentation
of such feature and implement something similar.
Here are two links for PRACK Interworking
<https://docs.oracle.com/en/industries/communications/session-border-controller/9.1.0/configuration/sip-prack-interworking.html#GUID-DF953FC6-35D0-4C8B-8812-3D7E72F7795E>and
UPDATE Interworking
<https://docs.oracle.com/en/industries/communications/session-border-controller/9.1.0/configuration/update-interworking.html#GUID-17824ABA-36FE-4E50-A6EB-F3BADEA9767E>
As these features are prerequisite for a project we are involved, we
are willing to contribute in any way to speed up the process.
Regards
**
*Antonis Psaras*
*From:* Users <[email protected]> *On Behalf Of
*Giovanni Maruzzelli
*Sent:* Τρίτη, 25 Νοεμβρίου 2025 13:14
*To:* Bogdan-Andrei Iancu <[email protected]>
*Cc:* Giovanni Maruzzelli <[email protected]>; OpenSIPS users
mailling list <[email protected]>
*Subject:* Re: [OpenSIPS-Users] PRACK interworking requirements
On Tue, Nov 25, 2025, 11:57 Bogdan-Andrei Iancu <[email protected]>
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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