Voice AI

Different types of Voice AI Agents to Build and Sell

Most people building voice AI agents pick one model and never realise how many they could be selling. There is

How To Connect Telnyx to n8n

If you bought a number from Telnyx and want to send SMS from n8n, you need to connect your Telnyx

How to fix Test Webhook Failed in Retell AI

Retell lets you test your webhook by clicking the 'Test' button, which you should use to confirm that

How to Use Telnyx number for Retell Voice AI Agent

Note: This article is in conjunction with the following articles:  1. Understanding PBX for Voice AI,  2. Overflow and After-

Twilio or Telnyx Phone Numbers For Voice AI Agents?

If you have to choose between the two carriers, Telnyx is the better option for Voice AI Agents. Telnyx is

How To Bill Your Voice AI Clients Like A Pro.

If you're building voice AI agents for clients, you need to understand how billing really works. Because it&

How to Use Live Monitoring in Retell AI

Live monitoring in Retell AI lets you listen to live calls between your caller and the voice agent. It lets

How to correctly use Expressive Mode in Retell AI

In Retell AI, expressive mode is available for Platform voices which is used to control how your voice agent sounds.

Using Twilio with Retell AI via SIP Trunking for Voice AI Agents

Note: This article is in conjunction with the following articles:  1. Understanding PBX for Voice AI,  2. Overflow and After-

Building post-call data extraction variables in Retell AI

This article explains how to build reliable post-call data extraction for voice AI agents.  By the end, you'

Building a Retell AI Multilingual Voice Agent

A multilingual voice agent can understand and reply in more than one language during a single call.  The multilingual voice

Understanding Environment Tags in Retell AI

What are Environment Tags in Retell AI? An environment tag is a named pointer that you attach to a version

Understanding Versioning in Retell AI

Versioning lets you update a voice agent while keeping other versions unchanged. This means you can keep improving an agent

Fix something you don't understand = add complexity you understand even less

Many AI content developers will tell you that you don't really need to know n8n anymore. Just use

Your automation workflows are guaranteed to fail under production load without this.

The biggest mistake companies make in AI workflow development is trying to automate 100% of their processes, and that too

Reducing Voice Agent Latency by Testing Different TTS Engines

If, for whatever reason, you can not reduce the token size of your voice agent prompt but still want to

Zero-Width Characters in Voice Agent Prompts

Check your voice agent prompt for zero width character immediately after creating the first draft of the prompt. What are

What over 1000 Hours of AI Training Taught Me

I’ve been tracking my time for over a decade using a time-tracking tool called 'Hravest'. So

Four LLM Failure Modes and One User Failure Mode

As I crossed over 1000 hours working with AI, I discovered 4 LLM failure modes and 1 user failure mode.

Run both Voice AI agent and test simulator on the same model

Your Voice AI Agent uses a specific LLM model: Make sure your test simulator (feature used for simulation testing) uses

Most AI Projects Fail. But Yours Will Succeed.

Most AI projects fail esp at the enterprise level. “95% of enterprise AI and GenAI pilots fail to achieve measurable

Retell AI Current Time Awareness has a reliability problem.

Retell AI ships a feature called Current Time Awareness.  You set a timezone, and the platform is meant to inject

The 80/20 Rule of Voice Agent Development

I have been testing a voice agent for the last 3 weeks. That seems like a lot of testing. Yes,

Understanding Retell AI Transfer Screening Agents.

Open the Retell AI dashboard, and you will find a tab labelled "Transfer Screening Agents."  Click on the

Abuse Ladder in Voice AI - Stop hostile calls from spiralling

What is the Abuse Ladder in Voice AI? The abuse ladder is a short, structured response script for when a

When to split your voice agent - The Bleed Test Framework.

I built Mark, a voice receptionist for an HVAC company. He runs on Retell, the platform we use to host

The Realistic Latency Target for Voice Agents.

Gemini 3.1 Flash-Lite Works Well for Voice AI.

Gemini 3.1 Flash-Lite is one of the best models for production voice AI right now. It is fast,

Use Contractions to make voice agents sound more natural

A contraction is a shortened form of two words, usually made by replacing missing letters with an apostrophe. Examples: Using

Avoid Using Tag Questions in Voice Agent Confirmations

If your voice agent ends calls too early, skips confirmations, or sounds like it is reading a script instead of