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With Project Fonos, Fonoster Inc researches an innovative Programmable Telecommunications Stack that will allow for an entirely cloud-based utility for businesses to connect telephony services with the Internet.

Special Announcement:

We now have a Slack Channel
There we plan to discuss roadmaps, feature requests and more
Join the channel


High-level overview

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Conceptual architecture and stack. We will post more details soon.


The most notable features on PF 0.1 are:

  • Cloud initialization with Cloud-Init
  • Multitenancy
  • Easy deployment of PBXs functionalities
  • Programmable Voice Applications
  • NodeJS SDK
  • Support for Amazon Simple Storage Service (S3)
  • Secure API endpoints with Let's Encrypt
  • Authentication with OAuth2
  • Authentication with JWT
  • Role-Based Access Control (RBAC)
  • Plugins-based Command-line Tool
  • Support for Google Speech API
  • Experimental support for Cloud Functions
  • Experimental support for Secret management

Code Examples

A Voice Application is a server that takes control of the flow in a call. A Voice Application can use any combination of the following verbs:

  • Answer - Accepts an incoming call
  • Hangup - Closes the call
  • Play - Takes an URL or file and streams the sound back to the calling party
  • Say - Takes a text, synthesizes the text into audio, and streams back the result
  • Gather - Waits for DTMF or speech events and returns back the result
  • SGather - Returns a stream for future DTMF and speech results
  • Dial - Passes the call to an Agent or a Number at the PSTN
  • Record - It records the voice of the calling party and saves the audio on the Storage sub-system
  • Mute - It tells the channel to stop sending media, effectively muting the channel
  • Unmute - It tells the channel to allow media flow

Voice Application Example:

const { VoiceServer } = require("@fonos/voice");
const voiceServer = new VoiceServer({ base: '/voiceapp' });

voiceServer.listen((req, res) => {

// your app will leave at 
// and you can easily publish it to the Internet with:
// ngrok http 3000

Everything in PF is an API first, and initiating a call is no exception. You can use the SDK to start a call with a few lines of code.

Example of originating a call with the SDK:

const Fonos = require("@fonos/sdk");
const callManager = new Fonos.CallManager();{
 from: "9842753574",
 to: "17853178070",
 webhook: ""

Getting Started

command-line tool

To get started with PF use the following resources:

Bugs and Feedback

For bugs, questions, and discussions, please use the Github Issues


For contributing, please see the following links:

We're glad to be supported by respected companies and individuals from several industries. See our Github Sponsors learn more.

Platinum Sponsors

Find all supporters in our file.

Support Fono's developers on Gh Sponsors



Copyright (C) 2021 by Fonoster Inc. MIT License (see LICENSE for details).