How to build a voice phone agent
Free blueprint for a voice phone agent. A low-code, single-agent, cloud-hosted stack with 12 connected components. Built around Voiceflow, HubSpot, Flowise, ChatGPT / OpenAI. Copy it, export it, or change the answers to fit your project.
Voice agent
A low-code, single-agent, cloud-hosted stack with 12 connected components.
Architecture map
Tap a component to see its connections
Swipe sideways to see the whole map
Tool configuration
Interface & triggers
Speech-to-text
Turns the caller's voice into text in real time
Deepgramor AssemblyAI
Voice output
Speaks the agent's reply naturally
ElevenLabsor Cartesia, Play.ht
Orchestration
Visual agent canvas
Drag-and-drop agent loop you can extend
Flowiseor Langflow, Dify
Reasoning
Reasoning model
General-purpose model with tool calling
ChatGPT / OpenAIor Claude, Gemini
Fast helper model
Handles quick, routine steps to cut delay and cost
Groq Cloudor Together AI, OpenRouter
Memory & knowledge
Conversation memory
Keeps track of the current chat or task
Built into your orchestratorDocument ingestion
Splits and indexes your files and pages
Built-in knowledge baseor Firecrawl, LlamaIndex
Vector database
Finds the most relevant passages for each question
Pineconeor Weaviate, Qdrant
Tools & integrations
CRM
Looks up and updates customer records
HubSpotor Salesforce
Voice agent builder
Designs call flows and hand-offs to people
Voiceflowor Hume AI
Monitoring & safety
Guardrails
Blocks unsafe input, prompt injection and data leaks
Input & output checksor Allow-list of tool actions
Tracing & evaluation
Records every step, cost and answer quality
Langfuseor LangSmith, Weights & Biases
Set up your agent, step by step
Tick each step as you finish it. Your progress is saved with this plan in your AItooling account.
0 of 20 done
AItooling never signs up for you and never asks for your passwords or keys. You create each account yourself on the tool's own website, and only your ticks are saved here.
Sign in and save this plan to keep your progress in your account.
1Create your accounts
Sign up or install it, then make a new project for this agent.
Sign up and set up the place where people will talk to the agent.
Sign up and set up the place where people will talk to the agent.
Sign up, create an API key and set a monthly spending limit before anything else.
Sign up, create an API key and set a monthly spending limit before anything else.
Sign up and create a new database or index just for this agent.
Sign up and connect only the apps this agent needs, with read-only access where you can.
Sign up and connect only the apps this agent needs, with read-only access where you can.
Sign up and turn on logging so you can review what the agent does.
2Build it in this order
3Launch your agent
Copy the ready-made code for this agent. It hides secrets and personal data before the AI model sees them.
Put each key in a password manager or your hosting's secret settings. Never paste keys or passwords into AItooling or a chat.
Start small, read every answer yourself, and only then let other people use it.
Want to go deeper?
Read our step-by-step guides on building agents. Browse guides