List of the Top 9 Free PBX Software in 2025

3CX is a versatile, software-driven IP PBX built on open standards that delivers comprehensive Unified Communications straight out of the box. It caters to businesses of all sizes and across various sectors, offering a full suite of features that range from mobility and presence indicators to sophisticated call center functionalities, all at a significantly reduced cost. This platform is particularly well-suited for remote work environments, featuring mobile applications, video conferencing capabilities, and live chat integration for websites. Installation, management, and maintenance of the PBX are straightforward, allowing users to easily handle it themselves on their own hardware, a dedicated server, or via a cloud environment. Alternatively, users can opt for 3CX's hosting services to simplify their setup even further. With its user-friendly design and extensive feature set, 3CX empowers companies to enhance their communication strategies effectively.

VitalPBX is a comprehensive PBX platform built on Asterisk and designed to operate on Centos 7. This powerful and adaptable platform enables users to effortlessly manage their PBX systems with ease. With an intuitive user interface complemented by helpful tooltips, navigating through the system is straightforward. It is essential for telephony systems to remain vigilant about potential security vulnerabilities and implement measures to mitigate these risks. VitalPBX provides multiple layers of defense to safeguard against cyber threats in the realm of VoIP communications. Moreover, its security features ensure that users can maintain a reliable and secure communication environment.

The word "Free" in FreePBX embodies the concept of Freedom, underscoring that FreePBX is the foremost open-source IP PBX solution worldwide, which enables users to design a tailored phone system that aligns with their unique needs. Delve into the possibilities of open-source communication and investigate the wide array of features offered by FreePBX that assist in building your perfect phone system. By incorporating commercial modules from Sangoma and a variety of other enhancements, you can transform your FreePBX setup into a robust Unified Communications platform. Remember to consult the Knowledge Base on the FreePBX Wiki for further information! Alternatively, seeking support from FreePBX experts can aid you with installation, updates, troubleshooting, and additional services. FreePBX is accessible for free download and usage, and its strength is bolstered by a global community of developers committed to ensuring its high compatibility and flexibility, which guarantees it encompasses all necessary functionalities required to establish a scalable business phone system for any budget. This community-driven approach not only promotes innovation but also ensures ongoing advancements, solidifying FreePBX as a dependable option for diverse communication requirements. With its extensive resources and community support, users can continually enhance their experience and capabilities.

Asterisk is a dynamic open-source framework that facilitates the development of a variety of communication applications. It enables a standard computer to function as a powerful communications server. Asterisk is integral to IP PBX systems, VoIP gateways, conference servers, and many other customized solutions. Its user base includes small businesses, large corporations, call centers, telecom operators, and government entities around the world. Provided free of charge, Asterisk is backed by Sangoma's support. Currently, there are over a million Asterisk-powered communication systems in operation across more than 170 countries. Notably, virtually all companies within the Fortune 1000 list leverage Asterisk in some form. Frequently adopted by system integrators and developers, Asterisk can serve as the basis for a complete business phone system or be used to enhance an existing setup or link various systems. Whether you aim to design a bespoke system using Asterisk or are interested in acquiring an effective and affordable turnkey solution, there are numerous options to explore that can help you find the perfect match for your requirements. As it adapts to technological advancements and user needs, Asterisk remains a key player in the evolving landscape of modern communication solutions. Its ongoing development ensures users continue to benefit from innovative features and improved performance.

MikoPBX provides a robust phone system renowned for its high efficiency, remarkable reliability, and a wide array of features. Users can choose to implement it on-site via hardware setup or utilize it on various cloud services, including Google Cloud, Amazon Web Services, and Microsoft Azure. A standout aspect of MikoPBX is that it is offered as a free telephone solution, delivering all vital business functions without any associated costs. The user-friendly web interface is packed with functionalities such as call recording, conference calling, voicemail, call transfers, call pickup, call queues, an interactive voice response (IVR) setup, and customizable rules for inbound and outbound calls. Moreover, users can manage holiday schedules and set preferences for night-time calls effortlessly. The system's ability to incorporate globally developed plugins and modules further enhances its adaptability to meet specific business needs. A significant advantage of MikoPBX is its lack of user licensing fees, making it an affordable option for companies aiming to grow without the burden of additional costs for new personnel or call recording features. This capacity for scalable growth ensures that organizations can enhance their communication capabilities while keeping their infrastructure strong. Ultimately, MikoPBX stands out as an exemplary solution for businesses seeking both efficiency and cost-effectiveness in their communication systems.

OpenSIPS serves as an open-source SIP proxy/server capable of managing voice, video, instant messaging, presence, and a variety of other SIP extensions. This adaptable signaling SIP server is tailored for carriers, telecom operators, and ITSPs, offering solutions for a broad range of applications including Class 4 and Class 5 residential platforms, trunking and wholesale services, as well as enterprise and virtual PBX systems. It also functions effectively as a session border controller, application server, load balancer, and is utilized in call centers among many other applications. With the ability to handle high throughput, it supports tens of thousands of calls each second along with millions of concurrent connections, making it a favored option for numerous SIP use cases. The strength of OpenSIPS lies in its flexible routing and integration capabilities, enabling users to implement custom routing logic via routing scripts and a wealth of interfacing APIs. Featuring over 120 modules, it supports robust application development for SIP management, backend operations, and routing processes. Furthermore, the 3.2 version of OpenSIPS has received a comprehensive security audit, bolstering its safety and dependability for users. As a resilient framework, it not only caters to present requirements but also adapts and evolves to meet the ever-changing challenges within the telecommunications sector, ensuring its relevance for years to come. This commitment to continuous improvement underscores the importance of innovation in maintaining a competitive edge in the industry.

CompletePBX, Xorcom's core telephone system solution, serves as a Virtual IP PBX (Private Branch Exchange) or Phone System Appliance, integrating Asterisk and Linux to ensure robust stability and high operational performance. Developed with user-friendliness, advanced functionalities, and comprehensive security in mind, CompletePBX is designed to meet the diverse needs of modern communication. You can access a fully functional evaluation of the CompletePBX 5 virtual machine at no cost! Additionally, free online certification training for CompletePBX is offered, providing a foundational understanding of the system that can significantly streamline your learning process. With our assistance, you can expedite your journey to mastering this powerful phone system.

This PBX software platform is crafted for straightforward installation and configuration, ensuring full compatibility with our telephony hardware. It is specifically tailored to meet the needs of small and medium businesses (SMBs) that aspire to utilize a premium phone system akin to those found in larger enterprises, all while avoiding excessive expenses. OpenPBX harnesses the accessibility and effectiveness of desktop computers, effortlessly merging them with conventional telephone handsets to offer sophisticated features and complete oversight of your communication system. Whether you're looking to connect to primary rate (E1/T1) trunk lines or regular POTS lines, Voicetronix supplies the necessary line interface hardware. Customers have the option to utilize the OpenPBX Do-it-Yourself (DIY) feature, enabling them to build their own phone systems with cost-effective PC servers operating on Linux and regular analog telephones. By taking charge of the setup and maintenance of their phone systems, users can free themselves from reliance on technicians for installation and support. Furthermore, with a simple web browser interface, users can easily manage their voicemail messages, enhancing the overall experience of communication management. This flexibility empowers users to tailor their phone systems to their specific preferences and requirements.

Vodia is a PBX solution that operates on both Windows and Linux platforms, delivering a comprehensive suite of advanced functionalities typically associated with robust PBX systems, such as call queues, auto attendants, and call forwarding capabilities. Additionally, Vodia stands out as a leader in Multi-Tenancy, allowing users to deploy it on a dedicated virtual machine in the cloud or on-site while managing numerous fully qualified domain names for different clients. You can experience Vodia by signing up for a free demo license, valid for 60 days, to explore its features firsthand. This trial is an excellent opportunity to see how Vodia can cater to your specific telecommunication needs.