The short answer is that Kamailio is a SIP proxy, and what you're describing is a Back to Back User Agent (B2BUA), so there's no easy direct way to do this. It's also worth noting that the default config for kamailio's max_branches is 12 and has an upper limit of 31. A better question might be why you need a separate call-id for each call. Kamailio will generate a new branch parameter for the via's that it adds, so this shouldn't be necessary. Regards, Kaufman. From: Vanderlei Torres Batistela via sr-users <sr-users(a)lists.kamailio.org> Sent: Tuesday, November 7, 2023 11:36 AM To: sr-users(a)lists.kamailio.org Cc: Vanderlei Torres Batistela <v.batistela(a)hotmail.com> Subject: [SR-Users] Sequential fork with different Call-Ids CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hello all, I have a scenario on wich requires sequential fork (up to 30 possible destinations) with different Call-ID for each leg. I am using topoh module enabled, but it always puts the same Call-ID. Someone have a solution for this scenario? Regards