fonoster/fonoster - OSS Alternative - Discover Top Open Source Alternatives to Popular Software
Programmable Telecommunications Platform
7.9k 2026-05-06

fonoster/fonoster

An open-source, cloud-based programmable telecommunications stack that enables businesses to connect telephony services with the internet.

Core Features

Multitenancy and easy PBX functionalities deployment.
Programmable Voice Applications with a NodeJS SDK.
Secure API endpoints with OAuth2/JWT authentication and RBAC.
Integration with Amazon S3 and Google Speech APIs.

Detailed Introduction

Fonoster is an innovative open-source programmable telecommunications stack designed to serve as a cloud-based utility for businesses of all sizes. It provides a robust and flexible platform to seamlessly integrate traditional telephony services, such as PSTN calls, with modern internet-based applications and workflows. Offering advanced features like multitenancy, easy deployment of PBX functionalities, and a powerful NodeJS SDK for building sophisticated programmable voice applications, Fonoster aims to be a cost-effective and highly customizable alternative to proprietary solutions like Twilio. By empowering developers with full control over their communication infrastructure, Fonoster facilitates the creation of bespoke communication experiences and streamlines business operations.

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