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from elevenlabs import AgentConfig, ConversationalConfig, ElevenLabs
elevenlabs = ElevenLabs(api_key="YOUR_API_KEY")
# Define transfer rules
transfer_rules = [
    {
        "transfer_destination": {"type": "phone", "phone_number": "+15551234567"},
        "condition": "When the user asks for billing support.",
        "transfer_type": "conference",
        # Wait 1s, then dial extension 1234 (native Twilio only)
        "post_dial_digits": {"type": "static", "value": "ww1234"},
    },
    {
        "transfer_destination": {"type": "phone", "phone_number": "+15559876543"},
        "condition": "When the user asks to speak to a human.",
        # Native Twilio integration only, preserves caller ID, no warm transfer message
        "transfer_type": "blind",
    },
    {
        "transfer_destination": {"type": "sip_uri", "sip_uri": "sip:support@example.com"},
        "condition": "When the user requests to file a formal complaint.",
        "transfer_type": "sip_refer",
        "custom_sip_headers": [
            {"type": "static", "key": "X-Department", "value": "complaints"},
            {"type": "static", "key": "X-Priority", "value": "high"},
            # Use "dynamic" to read the value from a dynamic variable
            {"type": "dynamic", "key": "X-Customer-ID", "value": "{{customer_id}}"},
        ],
        "uui": {
            "data": "account_id={{customer_id}}",
            "protocol_discriminator": "04",           # Genesys Cloud; omit for Talkdesk
            "protocol_discriminator_mode": "prefix",  # or "pd_parameter"
        },
    },
]
response = elevenlabs.conversational_ai.agents.create(
    conversation_config=ConversationalConfig(
        agent=AgentConfig(
            first_message="Hi, how can I help you today?",
            prompt={
                "prompt": "You are a helpful assistant.",
                "built_in_tools": {
                    "transfer_to_number": {
                        "type": "system",
                        "name": "transfer_to_number",
                        # Optional custom description
                        "description": "Transfer the user to a human operator based on their request.",
                        "params": {
                            "system_tool_type": "transfer_to_number",
                            "transfers": transfer_rules,
                        },
                    }
                },
            },
        ),
    ),
)
# Note: When the LLM decides to call this tool, it needs to provide:
# - transfer_number: The phone number to transfer to (must match one defined in rules).
# - client_message: Message read to the user during transfer.
# - agent_message: Message read to the human operator receiving the call (native Twilio integration only, not used for blind transfers or SIP).