Best Free PBX Software of 2025

3CX is an open-standards, software-based IP PBX that provides complete Unified Communications right out of the box. 3CX is suitable for all industries and sizes. It can provide everything you need, from mobility and status to advanced call center features and more, at a fraction the cost. 3CX is ideal for remote companies and includes mobile apps, video conference, and website live chat. The installation, management, and maintenance of the PBX are so simple that you can easily manage it yourself, on your own appliance, server, or on a cloud-based platform. You can also choose to have it hosted on 3CX for an easy solution.

VitalPBX is a unified communications PBX platform based on Asterisk (Centos 7). VitalPBX is a robust, scalable platform that will allow you to manage your PBX in a simple and intuitive manner. VitalPBX has a simple user interface and tooltips throughout the system. Telephony systems should be aware of security risks and take steps to avoid them. VitalPBX offers a variety of levels of protection against cyber threats in VoIP.

The term "Free" in FreePBX signifies Freedom, highlighting that FreePBX, the leading open-source IP PBX solution globally, empowers users to create a customized phone system that meets their specific requirements. Explore the potential of open-source communication and examine the extensive range of features that FreePBX provides to help you construct your ideal phone system. By integrating commercial modules from Sangoma and various other add-ons, you can elevate your FreePBX installation into a powerful Unified Communications platform. Don't forget to check the Knowledge Base on the FreePBX Wiki for additional resources! Alternatively, you can reach out to FreePBX professionals for assistance with installation, updates, troubleshooting, and more. Available for free download and use, FreePBX's strength is supported by a worldwide community of developers dedicated to maintaining its high compatibility and customizable nature, ensuring it delivers all the essential functions needed to create a scalable business phone system that accommodates any budget. This collaborative effort fosters innovation and continuous improvement, making FreePBX a reliable choice for communication needs.

Issabel stands out as an open-source unified communications platform that merges various IP communication services into one cohesive system, effectively overcoming the limitations of traditional PBX systems by offering features like call center functionalities, email integration, management reporting, fax capabilities, video conferencing, audio recording, and CRM integrations. Its call center module is not only robust and flexible but also user-friendly, enabling efficient automation and management of contact centers while adeptly handling both inbound and outbound call campaigns through a straightforward agent interface and call management tools. Additionally, Issabel simplifies the administration of PBX solutions for service providers, allowing them to manage multiple clients from a single instance, thus alleviating the need for individual servers for each client. To further expand its capabilities, Issabel accommodates various add-ons that are designed to integrate seamlessly with the platform, enhancing features that interact with telephony and improve customer service while automating support-related actions. This adaptability makes Issabel a highly effective choice for organizations looking to streamline their communication processes.

Asterisk is a versatile open-source framework designed for creating various communication applications. It transforms a standard computer into a robust communications server. Asterisk serves as the backbone for IP PBX systems, VoIP gateways, conference servers, and numerous other tailored solutions. Its users range from small enterprises to large corporations, call centers, telecom carriers, and government bodies across the globe. Available at no cost, Asterisk thrives under the sponsorship of Sangoma. Currently, over a million Asterisk-based communication systems operate in more than 170 nations. Remarkably, nearly all companies listed in the Fortune 1000 utilize Asterisk in some capacity. Most frequently implemented by system integrators and developers, Asterisk can serve as the foundation for a comprehensive business phone system or can be employed to augment an existing setup or connect disparate systems. Whether you're interested in crafting a personalized system with Asterisk or purchasing an efficient, affordable turnkey solution, explore the options available to determine the best fit for your needs. With its flexibility and wide-ranging applications, Asterisk continues to evolve, ensuring it meets the demands of modern communication.

MikoPBX offers a comprehensive phone solution characterized by high performance, exceptional stability, and extensive features. It can be deployed on-premises through hardware installation or hosted on various cloud platforms like Google Cloud, Amazon Web Services, and Microsoft Azure. Notably, MikoPBX is a free telephone system that provides all essential business functionalities at no cost. Users will appreciate the intuitive web interface, which includes features such as call recording, conference calling, voicemail, call transfers, call pickup, call queues, an interactive voice response (IVR) menu, as well as customizable inbound and outbound call rules. Additionally, the system includes options for managing holiday schedules and night-time call settings. MikoPBX supports the integration of plugins and modules developed globally, allowing for enhanced functionality tailored to specific needs. Importantly, MikoPBX does not impose user licensing fees, making it an economical choice for businesses looking to expand without incurring extra costs for new staff or call recording capabilities. This flexibility in scaling ensures that businesses can grow seamlessly while maintaining a robust communication infrastructure.

OpenSIPS is an open-source SIP proxy/server designed for handling voice, video, instant messaging, presence, and various other SIP extensions. This versatile signaling SIP server caters to carriers, telecom operators, and ITSPs, providing solutions for diverse applications such as Class 4 and Class 5 residential platforms, trunking and wholesale services, enterprise and virtual PBX systems, session border controllers, application servers, load balancers, IMS platforms, call centers, and much more. Its high throughput capability supports tens of thousands of calls per second and millions of simultaneous connections, making it a preferred choice for various SIP scenarios and services. OpenSIPS excels due to its flexible routing and integration options, which allow for custom routing logic through routing scripts and numerous interfacing APIs. With over 120 modules available, it facilitates effective application development for SIP handling, backend operations, and routing logic. Additionally, the 3.2 release of OpenSIPS underwent a thorough security audit, enhancing its safety and reliability for users across the board. This robust framework not only meets current demands but also continuously evolves to address future challenges in the telecommunications landscape.

Virtual IP PBX (Private Branch Exchange), or Phone System Appliance – CompletePBX is the heart and soul of Xorcom's hardware and software telephone systems. It's built on top of Asterisk and Linux platforms and is designed for stability and high performance. CompletePBX was built from the ground up to offer ease-of-use, advanced features, and security at all levels. Get a fully functional, free CompletePBX 5 virtual machine evaluation now! CompletePBX certification training is available online for free. It will guide you through the basics of the system. You can save a lot of time and effort if you do it yourself. We can help you get there quicker.

This PBX software platform is designed for easy installation and configuration, and it is fully compatible with our telephony hardware. It caters to small and medium businesses (SMBs) that desire a high-quality phone system typically associated with larger corporations, but without the hefty cost! OpenPBX leverages the user-friendly nature and efficiency of desktop PCs, seamlessly integrating them with traditional telephone handsets to provide advanced features and complete control over your communication system. Whether you need to connect to primary rate (E1/T1) trunk lines or standard POTS lines, Voicetronix offers the appropriate line interface hardware. Customers can take advantage of the OpenPBX Do-it-Yourself (DIY) option, allowing them to construct their own phone system using affordable PC servers running Linux and standard analog telephones. By configuring and maintaining their own phone system, users can eliminate the dependence on a technician for setup and support. Additionally, with a web browser, users can effortlessly navigate the system to select and listen to their voicemail messages, making communication management more convenient and efficient than ever before.

Vodia is a software-based PBX that runs on Windows and Linux. It offers all the advanced features you would expect from a full-featured PBX, including call queues, auto attendants and call forwarding. Vodia is also the pioneer in Multi-Tenancy. You can host Vodia on a dedicated VM( Virtual Machine) in the cloud, premises, and maintain multiple FQDNs for each customer. Sign up for a hosted demo license code for 60 days.