----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Call Ended Reason]() * [Prompting Guide]() * [Implementing Realtime Conversation]() * [Inbound Calling]() -----------------------------

### Answer To achieve human handoff or transfer a call under specific conditions using Vapi, the AI agent can utilize the

transferCall

function. This function is available when a

forwardingPhoneNumber

is defined for the assistant. The

transferCall

function allows the assistant to transfer the call to the specified forwarding number. Here is an example configuration:

json
{
  "model": {
    "provider": "openai",
    "model": "gpt-3.5-turbo",
    "messages": [
      {
        "role": "system",
        "content": "You are an assistant at a law firm. When the user asks to be transferred, use the transferCall function."
      }
    ]
  },
  "forwardingPhoneNumber": "+16054440129"
}

[(1)]() This setup can be tailored within the assistant's configuration to trigger the call transfer under the conditions you specify, such as specific user requests or other predetermined criteria.