Thank you Giovanni for starting this.
So, the feature should focus on generating the PRACK requests. Maybe
this should be decoupled from the `100rel` management, as this can be
received or locally inserted. And you can easily do it from script:
https://opensips.org/html/docs/modules/3.6.x/sipmsgops.html#func_list_hdr_add_option
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?
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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