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Introduction

Function calling transforms your AI agent from a conversational interface into an action-oriented assistant. By connecting your agent to functions, you enable it to interact with external systems, manage call flows, and perform real-world tasks.

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Common Use Cases

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Call Management

  • Transfer calls: Route to human agents or other departments
  • End calls: Gracefully terminate conversations
  • Send DTMF tones: Navigate phone menus

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Business Operations

  • Schedule and book appointments
  • Check availability across systems
  • Create, modify, or cancel orders

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Data Integration

  • Retrieve information from external systems
  • Update customer records and case details
  • Trigger notifications via email, SMS, or push

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How Function Calling Works

1

LLM detects need

Based on conversation context, the LLM determines when a function is needed.
2

Parameters extracted

The agent pulls the required values from the conversation.
3

Function executes

UponAI runs the function against the configured endpoint or built-in tool.
4

Result integrated

The response feeds back into the ongoing conversation.

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Available Function Types

Pre-built Functions

Six ready-to-use options: End Call, Transfer Call, Press Digits, Check Availability, Book Calendar, and Send SMS.

Custom Functions

Connect your own APIs, implement business logic, and trigger workflows in external systems.

Code Tool

Execute JavaScript directly in UponAI’s sandbox for data transformation, simple API calls, and calculations — no external server needed.

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Configuring Tool Calls

Add functions from the Functions section of your agent in the UponAI Dashboard. Each function type has its own configuration panel.
Always update your agent’s prompt to tell it explicitly when to call each function. Tool descriptions alone are not always enough for consistent behavior.