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Customnewupdated May 25, 2026 · other · support

Customer Service Agent with Function Calling and Order Management

A reference implementation demonstrating function calling patterns with voice agents, including customer information lookup, order history retrieval, appointment scheduling, and graceful conversation termination. Built with Flask and WebSockets, it showcases natural conversation flow with agent filler messages and UI-based debugging logs.

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The numbers

latency—

cost / min—

frameworkCustom

The stack

telephonyWeb Only

speech-to-textDeepgram Nova-2

llmGPT-4o

text-to-speechDeepgram Aura-2

System prompt

No prompt published.

Config

config.json

{
  "tools": [
    {
      "name": "customer_lookup",
      "description": "Look up customer information by phone number or email"
    },
    {
      "name": "order_history",
      "description": "Retrieve order history for a customer"
    },
    {
      "name": "appointment_scheduling",
      "description": "Schedule appointments for customers"
    },
    {
      "name": "end_call",
      "description": "Gracefully terminate the conversation"
    }
  ],
  "function_calling": true,
  "mock_data_system": true,
  "browser_audio_output": true,
  "artificial_delay_enabled": true
}

Tools

customer_lookupLook up customer information by phone number or email
order_historyRetrieve order history for a customer
appointment_schedulingSchedule appointments for customers
end_callGracefully terminate the conversation

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