Install asterisk-espeak by entering the following commands in the terminal:
sudo apt update sudo apt install asterisk-espeak
Description:
eSpeak module for Asterisk
Module for the Asterisk open source PBX which allows you to use the eSpeak voice synthesis engine to render text to speech.
Homepage: https://zaf.github.com/Asterisk-eSpeak/
Version: 4.0-1
Section: universe/comm