[SR-Users] Parallel forking - first responder wins

Ivan Ribakov i.ribakov at zaleos.net
Mon Apr 20 10:31:02 CEST 2020

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?

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