Hi there, has anyone experienced transferring a call between a SIP endpoint and a regular phone number? In our application, the customer can configure different phone numbers that the assistant will transfer the call to in different scenarios, but the assistant itself is only reachable via a SIP endpoint (that's a limitation on the customer end). The call is initiated via a soft phone to that SIP endpoint that we created but needs to be able to transfer a call to regular, normal phone numbers. I tried different things, but they didn't work out -> Calls themselves work normally, but it just ends the call abruptly when transfering (tool was called, but the call was also ended)

Hi! Yes, I’ve worked on similar SIP ↔ PSTN transfer setups before. From what you described, it sounds like the transfer tool is firing correctly, but the SIP side may not be handling the REFER/reINVITE flow properly, causing the original leg to terminate instead of bridging the PSTN destination. This can happen depending on the SIP provider, softphone behavior, or how the transfer is configured (blind vs attended transfer). I’d be happy to help troubleshoot the call flow and identify where it’s breaking. @Paulo