Despite the rise of modern messaging platforms and cloud communication tools, fax communication remains vital in sectors like healthcare, finance, government, and law—industries where compliance, security, and traceability are non-negotiable. With the continued demand for reliable document transmission, open source fax server software stands out as a cost-effective and flexible solution over outdated hardware or expensive commercial alternatives.
As businesses evolve in 2025, embracing open technologies for document management and communication has become more essential than ever. This year, we explore the top 5 open source fax server solutions, each offering unique capabilities for secure, scalable, and streamlined fax communication.
Why Choose Open Source Fax Server Software in 2025?
Enhanced Security and Compliance
Open source fax servers often support end-to-end encryption, TLS/SRTP protocols, and HIPAA/GDPR compliance features, providing peace of mind when transmitting sensitive data.
Cost Efficiency
Eliminate expenses related to fax machines, dedicated phone lines, paper, maintenance, and proprietary licensing. Open source software provides enterprise-level features with zero licensing fees.
Scalability and Integration
Whether you’re an SME or a large enterprise, these fax servers can scale on-demand and integrate easily with existing PBX, CRM, ERP, and email systems.
Flexibility Across VoIP & PSTN
Most modern open source fax solutions offer support for Fax over IP (FoIP) using T.38 or G.711 passthrough, while still maintaining compatibility with legacy PSTN environments.
Top 5 Open Source Fax Server Software in 2025
1. ICTFax – The Most Advanced Multi-Tenant Fax Server Software
![ICTFax Logo or UI Screenshot if applicable]
ICTFax continues to lead in 2025 with its powerful, scalable, and multi-tenant fax server capabilities. Built on FreeSWITCH, Plivo, and ICTCore, it’s an ideal solution for telecom operators, service providers, enterprises, and government organizations seeking robust faxing services.
Key Features:
- Multi-Tenant Architecture: Manage multiple clients, departments, or tenants from a centralized platform.
- WebRTC Integration: Send and receive faxes securely using web browsers—no software installation needed.
- Print2Fax Support: Windows-based Print2Fax application enables faxing from any printable document.
- Activity Monitoring: Real-time tracking of user and system activity, audit logs, and fax delivery reports.
- Secure Authentication: Advanced password policies, 2FA, and session management for enhanced user security.
- REST API: Easily integrate with third-party systems like WHMCS, CRMs, or custom portals.
- HIPAA-Ready: Ensures compliance with medical data retention and transmission laws.
Best For: Enterprises and service providers needing a full-fledged, multi-tenant, and highly secure fax platform.
2. HylaFAX+ – Reliable and Lightweight Faxing for Linux Environments
HylaFAX+ remains a reliable and easy-to-deploy fax solution for Linux users in 2025. It excels in setups where stability, simplicity, and classic fax transmission are priorities.
Key Features:
- Traditional PSTN Fax Support: Compatible with Class 1/2 modems and analog lines.
- Client/Server Architecture: Distribute fax jobs across multiple client machines.
- Email-to-Fax: Send faxes directly from email clients via scripting.
- Easy Automation: Integrate with shell scripts or cron for scheduled faxing.
Best For: Organizations needing a straightforward, no-frills fax server for Linux environments.
3 Asterisk with Fax for Asterisk (FFA) – Classic PBX Meets Modern Fax
Asterisk has long been a staple in VoIP PBX systems. Combined with Fax for Asterisk or spandsp, it offers a reliable and customizable faxing solution within traditional PBX systems.
Key Features:
- G.711/T.38 Fax Support: Supports both modern and legacy transmission standards.
- Scripting & Dialplan Control: Advanced routing and handling of fax calls via dialplan logic.
- PBX Integration: Seamless with voicemail, IVR, and other telephony features.
- Large Community: A well-established ecosystem and frequent updates.
Best For: Businesses already running Asterisk who want to extend it with fax capabilities.
4. FreeSWITCH – The Modular Fax-Over-IP Powerhouse
FreeSWITCH is a highly modular telephony platform supporting a wide range of communication protocols. Its robust T.38 FoIP support and modular plugin architecture make it ideal for custom fax solutions.
Key Features:
- T.38 Support: Reliable FoIP transmission over VoIP lines.
- Custom Module Integration: Build specialized fax routing, storage, and notification logic.
- Unified Communications: Combine fax with voice, video, and chat over the same framework.
- Scalability: Deploy in cloud environments or on-premise clusters.
Best For: Developers and integrators looking for full control over communication workflows.
5. ICTBroadcast – Multi-Channel Broadcasting with Fax Capability
Though known for its auto-dialer and voice broadcasting tools, ICTBroadcast also offers robust fax broadcasting features—making it a go-to choice for campaigns, mass communication, and outreach.
Key Features:
- Bulk Fax Broadcasting: Send thousands of faxes to a list of recipients with minimal setup.
- Unified Dashboard: Manage voice, email, SMS, and fax campaigns from one platform.
- Analytics and Reporting: Measure campaign success rates, deliverability, and user engagement.
- Integration: Connect with CRMs or databases to automate campaign launches.
Best For: Marketing firms, non-profits, and organizations needing fax as part of a larger communication strategy.
Trends to Watch in 2025
- Fax via WebRTC: Web-based fax sending/receiving without any plugins or drivers.
- Fax and AI: Integration with OCR and NLP for intelligent fax content recognition.
- Containerized Deployments: Docker and Kubernetes support for scalable deployments.
- SaaS Fax Models: Service providers using open source software to launch hosted fax services.
- Green IT Initiatives: Paperless fax solutions helping companies meet sustainability goals.
Conclusion: Faxing in the Digital Age
In 2025, open source fax servers are no longer just alternatives—they are the preferred choice for organizations aiming to digitize their document workflows securely, affordably, and efficiently. Whether you’re looking for multi-tenant capabilities, powerful fax broadcasting, or simple Linux-based faxing, these top five solutions offer unmatched flexibility and functionality.
ICTFax leads the pack with its advanced features and modern architecture, while FreeSWITCH and Asterisk cater to developers needing granular control. For those focused on campaign outreach, ICTBroadcast is the standout. And for simple, dependable Linux faxing, HylaFAX+ still holds ground.
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