[sr-dev] Kamailio functionality clarification - call forwarding no replay (call is ringing but not answered)

[VESELOVSKY Pavel]

Hallo all,

I would need help with Kamailio. I hope, you can give me some hints.

I would like use Kamailio for CFNRy feature call forward no replay, i.e.

  *   call is forked to multiple destination
  *   180 is received, call is ringing, but not answered, no 200 OK is received from some destination
  *   after predefined time (CFNRy timer), only this specific branch has to be rerouted to another destination


Expected behaviour is described in this flow:
[cid:image001.png at 01D85B0C.FCF06DE0]
My current behavior:

  *   Kamailio TM module is involved for parallel forking (https://www.kamailio.org/docs/modules/stable/modules/tm.html#:~:text=1.-,Overview,-The%20TM%20module)
  *   all branches are CANCEL-ed, it is not possible send CANCEL just to one specific branch
[cid:image002.png at 01D85B0C.FCF06DE0]

My questions:

  *   is it possible to CANCEL just specific branch?
  *   is it possible start timer just for specific branch?
  *   do you think is it possible somehow implement this feature with Kamailio?

Thanks a lot in advance for any comment.
Pavel.



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