Asterisk Review: A Versatile and Trusted Free PBX Solution

Short Introduction

Asterisk stands out as one of the most renowned and powerful options available in the realm of free PBX solutions. Developed by Digium (now part of Sangoma Technologies), Asterisk has gained a reputation for its flexibility, scalability, and feature-rich offerings. This review delves into the key aspects of Asterisk, including its history, features, user interface, underlying technology, security measures, and support options.

Link to asterisk website

Age and Popularity

Asterisk has a long-standing history in the world of telecommunications. Mark Spencer initially created it in 1999, and it has since evolved into a robust, open-source platform. Over the years, Asterisk has garnered significant attention and widespread adoption in small and large businesses. Its reputation as a reliable and versatile solution has propelled its popularity among telecommunication professionals.

Completely Free

Asterisk is free and open-source, offering users a comprehensive set of PBX features without licensing fees. The free version of Asterisk provides extensive functionalities, including call routing, voicemail, interactive voice response (IVR), conferencing, and more. Additionally, the open-source nature of Asterisk allows for customization and integration with other systems, enabling businesses to tailor the solution to their specific requirements. The absence of licensing costs makes Asterisk an attractive choice for organizations seeking a cost-effective PBX solution.


Asterisk provides a flexible and intuitive user interface through its web-based management console. The management console allows administrators to configure and control various aspects of the PBX system, such as extensions, call routing rules, voicemail settings, and call queues. While the initial setup and configuration may require technical expertise, Asterisk’s interface offers a user-friendly experience for ongoing management and administration tasks. The availability of graphical tools, wizards, and templates simplifies the configuration process, ensuring a smoother user experience.

Technology Used and Security

Technology Used and Security:
Asterisk is built on a solid foundation of cutting-edge technologies, including the Session Initiation Protocol (SIP) for call signaling and the Real-time Transport Protocol (RTP) for voice transmission. These protocols ensure compatibility with various IP phones, softphones, and other communication devices. Moreover, Asterisk incorporates robust security measures to protect against potential threats. Features such as encryption, authentication, access controls, and secure transport protocols contribute to maintaining the confidentiality and integrity of communications within the PBX system.

Support and Documentation

Asterisk benefits from an extensive and active community of developers, administrators, and users who contribute to its ongoing development and provide support. The community-driven approach ensures that Asterisk users can access many resources, including forums, mailing lists, and online documentation. The official Asterisk wiki, user guides, and tutorials provide comprehensive information on installation, configuration, troubleshooting, and advanced topics. Additionally, professional support options are available from Digium/Sangoma and various third-party vendors, allowing businesses to obtain expert assistance when needed.

Customization and Integration

One of Asterisk’s greatest strengths is its flexibility and extensibility. Being an open-source solution, Asterisk allows developers and system administrators to customize and extend its capabilities to suit specific business needs. Through the Asterisk Extension Language (AEL) or the more widely used Asterisk Dialplan Language (extensions. conf), users can create complex call routing rules, implement custom dialing features, and integrate with external systems. This level of customization empowers businesses to tailor their PBX system to their unique requirements, enhancing productivity and efficiency.

Scalability and High Availability

Asterisk is designed to scale alongside the growth of a business. It supports multiple telephony interfaces, including analog, digital, and IP-based connections, allowing businesses to expand their communication infrastructure as needed. Additionally, Asterisk’s distributed architecture enables the creation of highly available and redundant setups, ensuring uninterrupted communication even in the event of hardware failures or network issues. With proper planning and configuration, Asterisk can provide a reliable and scalable telephony solution for businesses of all sizes.

Advanced Features and Add-Ons

Asterisk offers an extensive array of advanced features that go beyond basic call handling. These features include call recording, call queuing, call parking, call detail records (CDR), voicemail-to-email, text-to-speech (TTS), and automatic call distribution (ACD). Moreover, Asterisk’s modular architecture allows for integrating numerous add-ons and third-party applications. This flexibility enables businesses to enhance their PBX system with CRM integration, unified communications, and interactive voice response (IVR) systems, further extending the solution’s capabilities.

Community and Ecosystem

One of the significant advantages of Asterisk is its vibrant and active community. The Asterisk community consists of developers, administrators, and users who collaborate, share knowledge, and contribute to the ongoing development of the software. The community-driven nature ensures continuous improvement, bug fixes, and feature enhancements. Users can engage with the community through forums, mailing lists, and conferences, gaining valuable insights and assistance from experienced Asterisk users. This thriving ecosystem fosters innovation and ensures that Asterisk remains a dynamic and relevant solution in the ever-changing world of telephony.

Integration with Other Systems

Asterisk’s open architecture and extensive APIs enable seamless integration with various external systems and applications. It supports integration with popular CRM platforms, such as Salesforce and SugarCRM, allowing businesses to streamline customer interactions. Additionally, Asterisk can integrate with other communication tools like instant messaging (IM) platforms, video conferencing systems, and collaboration suites, providing a unified communication experience. This integration capability enhances productivity, improves customer service, and promotes efficient collaboration within the organization.

Continuous Development and Updates

Asterisk benefits from a dedicated team of developers and contributors who actively work on improving the software. Regular updates and releases ensure users can access bug fixes, security patches, and new features. The development team keeps pace with industry standards and technology advancements, ensuring Asterisk remains a reliable and future-proof PBX solution.

In short (conclusion)

Asterisk has established itself as a leading free PBX solution with its flexibility, feature-richness, and strong community support. Its extensive features, customization options, scalability, and integration capabilities suit businesses of all sizes. The free version of Asterisk provides a robust foundation for building a reliable and cost-effective telephony system. At the same time, the open-source nature allows for customization and integration with other applications and systems.

Although initially requiring some technical expertise for setup and configuration, Asterisk’s user interface offers a user-friendly experience for ongoing management and administration. The web-based management console allows administrators to configure extensions, call routing rules, voicemail settings, and other system parameters. Graphical tools, wizards, and templates streamline the configuration process, empowering users to manage their PBX system efficiently.

From a technological perspective, Asterisk is built on SIP and RTP protocols, ensuring compatibility with a wide range of communication devices. Encryption, authentication mechanisms, access controls, and secure transport protocols enhance communications security within the PBX system. However, it is important to note that proper configuration and implementation of security measures are crucial to maintaining a secure environment.

The support and documentation available for Asterisk are extensive. The Asterisk community, comprising developers, administrators, and users, provides a wealth of resources through forums, mailing lists, and online documentation. The official Asterisk wiki, user guides, and tutorials offer comprehensive information on installation, configuration, troubleshooting, and advanced topics. Moreover, professional support options are available from Digium/Sangoma and third-party vendors, ensuring businesses can access expert assistance when needed.

As with any technology, it is essential to consider certain factors before implementing Asterisk. While the solution offers extensive features and flexibility, it may require technical expertise to leverage its capabilities fully. Organizations should evaluate their specific requirements and consider the available resources and support options to ensure successful deployment and ongoing maintenance.

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