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:

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

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.