Warm transfer experimental issue with zadarma Sip trunk @User Tool config and call ids Answer given by zadarma team about the calls on their side: Dear Juan Ayensa Barbarin, Your ticket is already being processed by the technical department. The calls shown in your examples appear to be one incoming call and one outgoing call, both processed correctly on our side. We did not receive any transfer attempt, meaning SIP REFER packets, for either of the two calls. These two calls should probably have been merged by Vapi. You can ask Vapi support: why were they not merged? You can also view and request the SIP traces in Vapi. As you mentioned earlier, “warm transfer” is an experimental Vapi feature. To learn more about how to use this experimental feature, we strongly recommend contacting the Vapi support team for any questions related to that functionality. Technical Department, Sergio. https://cdn.discordapp.com/attachments/1211486158232617032/1513469582466089022/message.txt?ex=6a292963&is=6a27d7e3&hm=99efee6520ea2dcd48d1f99d3ee822c37c67970123be8f517c69ca998a07fc8c&