Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

How it works 1. User Signup & Verification: The workflow starts when a user signs up. It generates a verification code and sends it via SMS using Twilio. 2. Code Validation: The user replies with t...

Best for

Support Chatbot automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.postgres, n8n-nodes-base.httprequest, n8n-nodes-base.switch, n8n-nodes-base.code, n8n-nodes-base.respondtowebhook, n8n-nodes-base.webhook, n8n-nodes-base.openai

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by John.

Original n8n.io source

1.1 Workflow description

Title: Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL
Workflow name: Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL

How it works

User Signup & Verification:
The workflow starts when a user signs up. It generates a verification code and sends it via SMS using Twilio.
Code Validation:
The user replies with the code. The workflow checks the code and, if valid, creates a session for the user.
Conversational AI:
Incoming SMS messages are analyzed by Chat GPT AI for sentiment, intent, and urgency. The workflow stores the conversation context and generates smart, AI-powered replies.
Escalation Handling:
If the AI detects urgency or frustration, the workflow escalates the session—alerting your team and sending a supportive SMS to the user.

Set up steps

Estimated setup time: 10–20 minutes for most users.
What you’ll need:
- A free n8n account (self-hosted or cloud)
- Free Twilio account (for SMS)
- OpenAI API key (for AI)
- A PostgreSQL database (Supabase, Neon, or local)
Setup process:
1. Import this workflow into n8n.
2. Add your Twilio and OpenAI credentials as environment variables or n8n credentials.
3. Update webhook URLs in your Twilio console (for incoming SMS).
4. (Optional) Adjust sticky notes in the workflow for detailed, step-by-step guidance.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 2 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 3 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 4 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Store Verification

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2

Block 6 - Send Verification SMS (Twilio API)

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4

Block 7 - Check Verification

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2

Block 8 - Validate Code

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3

Block 9 - Create Session

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 10 - Mark Verified

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2

Block 11 - Insert Session

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2

Block 12 - Verify Success Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1

Block 13 - Verify Failed Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1

Block 14 - Incoming SMS Webhook (Twilio)

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 1

Block 15 - 🤖 AI Sentiment Analysis

Type / Role: n8n-nodes-base.openAi - openAi
Config choices: Version 1

Block 16 - Process AI Analysis

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 17 - 🤖 AI Escalation Router

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3

Block 18 - Mark Session Escalated

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2

Block 19 - Send Escalation Email

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2

Block 20 - 🤖 AI Intent Router

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3

Block 21 - 🤖 AI Intake Enrichment

Type / Role: n8n-nodes-base.openAi - openAi
Config choices: Version 1

Block 22 - Merge Enriched Data

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 23 - 🤖 AI Response Generator

Type / Role: n8n-nodes-base.openAi - openAi
Config choices: Version 1

Block 24 - Send AI Response SMS

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4

Showing the first 24 of 49 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL
Complexity	advanced
Nodes	49
Categories	Support Chatbot, AI Chatbot
Author	John
Published	03 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9220/9220.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Support Chatbot workflows AI Chatbot workflows

Frequently asked questions

What does Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Support Chatbot, AI Chatbot use case.

John

1 workflow

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.postgres n8n-nodes-base.httprequest n8n-nodes-base.switch n8n-nodes-base.code n8n-nodes-base.respondtowebhook n8n-nodes-base.webhook n8n-nodes-base.openai

Complexity

advanced

Published 03 Oct 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/9220/9220.json

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Build an AI-powered SMS support system with Twilio, GPT-4 and PostgreSQL

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

Set up steps

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note

Block 2 - Sticky Note1

Block 3 - Sticky Note2

Block 4 - Sticky Note3

Block 5 - Store Verification

Block 6 - Send Verification SMS (Twilio API)

Block 7 - Check Verification

Block 8 - Validate Code

Block 9 - Create Session

Block 10 - Mark Verified

Block 11 - Insert Session

Block 12 - Verify Success Response

Block 13 - Verify Failed Response

Block 14 - Incoming SMS Webhook (Twilio)

Block 15 - 🤖 AI Sentiment Analysis

Block 16 - Process AI Analysis

Block 17 - 🤖 AI Escalation Router

Block 18 - Mark Session Escalated

Block 19 - Send Escalation Email

Block 20 - 🤖 AI Intent Router

Block 21 - 🤖 AI Intake Enrichment

Block 22 - Merge Enriched Data

Block 23 - 🤖 AI Response Generator

Block 24 - Send AI Response SMS

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions