Just thought of a follow up question - is it possible to find out which of the branches Kamailio chose as the winner? According to RFC multiple 200 OK could arrive before CANCEL is sent. Do I need to look for an outgoing ACK to know for sure which branch was chosen for sure or is there a way I could “catch” a winning branch through some sort of custom branch route (thinking along the lines of “t_on_branch_success”)?
Thanks, Ivan > On 20 Apr 2020, at 15:28, Ivan Ribakov <i.riba...@zaleos.net> wrote: > > Thanks for pointing me to the specific section, Giovanni! I was searching RFC > for the “fork” and “merge” keywords so I never got even close to this part of > RFC. > > >> On 20 Apr 2020, at 13:27, Giovanni Maruzzelli <gmar...@gmail.com >> <mailto:gmar...@gmail.com>> wrote: >> >> ( and is implemented in automatic: when receive the 200 OK for a branch (the >> winning one), Kamailio sends CANCEL to the other branches ) >> >> >> On Mon, Apr 20, 2020 at 12:48 PM Giovanni Maruzzelli <gmar...@gmail.com >> <mailto:gmar...@gmail.com>> wrote: >> 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.riba...@zaleos.net >> <mailto:i.riba...@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 <o...@edvina.net >>> <mailto:o...@edvina.net>> wrote: >>> >>> >>> >>>> On 20 Apr 2020, at 10:31, Ivan Ribakov <i.riba...@zaleos.net >>>> <mailto:i.riba...@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_forking >>>> >>>> <https://www.kamailio.org/docs/modules/stable/modules/tm.html#tm.serial_forking>) >>>> 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 >>> >>> _______________________________________________ >>> Kamailio (SER) - Users Mailing List >>> sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org> >>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>> <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> >> _______________________________________________ >> Kamailio (SER) - Users Mailing List >> sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org> >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >> <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> >> >> >> -- >> Sincerely, >> >> Giovanni Maruzzelli >> OpenTelecom.IT >> cell: +39 347 266 56 18 >> >> >> >> -- >> Sincerely, >> >> Giovanni Maruzzelli >> OpenTelecom.IT >> cell: +39 347 266 56 18 >> >> _______________________________________________ >> Kamailio (SER) - Users Mailing List >> sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org> >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >> <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> >
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