Pronounce the phone numbers correctly

Make Retell agents pronounce phone numbers clearly using the Read Slowly feature, with prompt examples and best practices for digit-by-digit pacing on calls.

Overview

This guide explains how to configure your AI agent to pronounce phone numbers correctly and consistently. We’ll use the Read Slowly feature to add pauses between words, enhancing clarity.

Prompting Technique

We’ll utilize the Read Slowly feature to add pauses between words. For more information, see the Speech Controllability documentation.

It’s recommended to include a prompt as a guideline for the LLM to follow. This ensures that the agent can consistently reply with the correct format, even if customers double-check the phone number.

Prompt Example

When people ask about your phone number, your phone number is 4158923245

## Guideline
When speaking the phone number, transform the format as follows:
- Input formats like 4158923245, [phone], or 415-892-3245
- Should be pronounced as: "four one five - eight nine two - three two four five"
- Important: Don't omit the space around the dash when speaking

Audio Example

Listen to this audio clip for a demonstration of proper phone number pronunciation:

Speak Phone Number Example