In cases where the AI agent attempts to transfer a call to someone who is busy and the transfer fails, how can we be notified of the failed transfer? What is your best practice to address this issue? We want to avoid having a high repeat rate.

You can set up real-time notifications in VAPI for failed call transfers so your system immediately knows when a transfer doesn’t go through. A common best practice is to create a fallback workflow that retries the transfer after a short delay or routes the call to an available agent, reducing repeat attempts. How are you currently tracking failed transfers—through logs, email alerts, or directly in your workflow system? @DanToy

Use the

transfer-update

serverMessage to receive updates on transfer tool calls by entering a serverUrl as the receiving end.