Maybe is not very explicit, but I believe section 16.7(10) of RFC 3261 deal
with it (sends CANCEL to branches)
-giovanni
On Mon, Apr 20, 2020 at 11:48 AM Ivan Ribakov <i.ribakov(a)zaleos.net> wrote:
As far as I understand, RFC3261 is not providing any
instructions on how
to deal with forked INVITES specifically. It just says that forking can
result in multiple dialogs that are part of the same original call. I
couldn’t find any prescriptions on how/when to deal with these multiple
dialogs specifically which makes me think it depends on the application.
Once again, please correct me if I’m wrong.
So, in the same way as RFC3261 is not talking about forked INVITE
priorities or parallelism, but Kamailio (TM module) is providing a
mechanism for forking in parallel/serial modes (advanced feature that is
not part of RFC3261, but is built on top of it), I’m wondering whether
Kamailio (TM module) is providing any advanced features for dealing with
forked INVITE responses.
Thanks,
Ivan
On 20 Apr 2020, at 11:13, Olle E. Johansson <oej(a)edvina.net> wrote:
On 20 Apr 2020, at 10:31, Ivan Ribakov <i.ribakov(a)zaleos.net> wrote:
Hi all,
What I’m trying to achieve is to have Kamailio fork an INVITE to multiple
endpoints in parallel but only maintain the branch that responds first
(first to respond with 200 OK I guess).
I’ve read the TM module documentation on forking (
https://www.kamailio.org/docs/modules/stable/modules/tm.html#tm.serial_fork…)
and as far as I understood a combination of “seturi()” + “append_branch()”
+ “t_relay()” command calls will allow me to send multiple forked INVITEs
in parallel.
What I couldn't find information about in the documentation (please point
me to it in case I missed it) is what controls (if any) do I have over
forked requests. Do I need to keep track of the branches myself and cancel
others when first succeeds or does Kamailio have some kind of setting for
implementing such behaviour?
It’s all implemented according to the RFC 3261 where you can read all the
cool details!
/O
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Sincerely,
Giovanni Maruzzelli
OpenTelecom.IT
cell: +39 347 266 56 18