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 <[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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