Operating a call center can be costly, especially with licensing fees and software that doesn’t quite match your business needs. That’s why many businesses are turning to open source call center software. It’s flexible, cost-effective, and puts you in full control of your existing system.
According to Grand View Research, the open-source software market reached $28 billion in 2023 and is projected to grow beyond $83 billion by 2030.
In this guide, we’ll explore 10 of the best open-source call center solutions to help you build a system that’s affordable, reliable, and tailored to your business needs.
✨ Key Takeaways
- The top picks were chosen based on functionality features such as IVR, VoIP, SIP Trunking, and ease of use for both small and large teams.
- Open source call center tools like Asterisk, VICIdial, & FreePBX stand out owing to their high performance, flexibility, scalability, and integration potential for customer interactions.
- Choosing the right call center software depends on your team size & feature requirements, such as integration with existing CRM systems or automatic call management.
What is open source call center software?
Open-source call center software is a type of call center platform that allows businesses to access and customize its source code. It provides integration with various CRM systems, other contact center software solutions, offering flexibility and control over call center operations.
This type of software is often favored for its affordability and adaptability to specific business needs, especially for small businesses looking to enhance customer experiences without the high operational costs of proprietary solutions.
Features to consider in open source call center software
When you choose open-source free call center software for your business, you should also verify the features they provide. The best call center software providers should offer both foundational and advanced features to support multiple operations smoothly.
- IVR (Interactive Voice Response): It helps callers reach the correct department or agent via automated voice menus, reducing call handling time and improving customer satisfaction.
- Automatic Call Distribution (ACD): Directs incoming calls automatically to the right agent or department, saving wait time and providing faster assistance.
- VoIP service & SIP trunking: Facilitates voice calls over the internet at affordable rates, with SIP trunking allowing multiple outbound calls on a single connection, ideal for growing teams to handle calls effectively.
- CRM and third-party integrations: Allow you to connect with tools like helpdesk software or power dialers, consolidating customer query data and processes in a single location.
- Scalability and multi-channel support: Facilitates growth and enables your team to communicate effectively via outbound calls, emails, live chat, or video. Offers complete unified communications.
How did we pick the best open source options?
Selecting the best open source contact center platforms involves defining project requirements and considering budget and timeline constraints. You need to focus on its key features, tools, and integrations with other systems.
Here are a few more things that need to be considered while choosing an open source software:
- Feature completeness: We ensured that all solutions provide the essential call center features, including phone tree (IVR), auto dialers, Automatic Call Distribution (ACD), SIP trunking, VoIP service, and video conferencing or unified communications, as applicable.
- Ease of setup and use: We ranked those higher platforms that offer simple installations and an intuitive, user-friendly interface without a full-time IT team.
- Scalability: Whether you’re a startup or a large support team center, the tools we’ve selected are built to scale with your team and call volumes.
- Integration capabilities: Our top-rated options integrate seamlessly with existing CRM systems, helpdesk software, power dialers, and more, allowing for streamlined workflows and centralized customer data in one location.
Top 10 open-source call center software for 2026
For businesses looking to optimize customer support while reducing operational costs, open source call center software offers powerful and flexible solutions.
Here are some of the most popular open-source call center platforms:
1. FusionPBX
FusionPBX is a powerful, open source call center software provider built on the FreeSWITCH platform. It’s designed for businesses that need a fully customizable and self-hosted solution.
Popular among IT teams and advanced users, FusionPBX provides robust VoIP service features and supports intricate call flows, making it an ideal choice for larger or more complex environments.
Key features
- Multi-tenant support: Run multiple call centers or clients from a single server setup, making it an efficient all-in-one platform.
- IVR & auto-attendant: You can set up IVR and auto-attendant systems to route call, deliver automated greetings, and handle all inbound calls.
- Voicemail and voicemail-to-email: It offers traditional voicemail services and can also send voicemail to your email, integrating with tools like Microsoft Teams.
- Inbound queue module: Ensure agent assignments and call queues are properly configured.
2. Asterisk
Asterisk is one of the most popular and influential open source call center solutions available till now. Known as the backbone of many VoIP systems, Asterisk is highly customizable and ideal for businesses that want full control over their call center operations and system features.
It’s best suited for teams with technical expertise and benefits from active community support.
Key features
- VoIP & SIP trunking support: Enables businesses to have flexible, internet-based calling with high scalability.
- IVR & Auto Call Distribution: Create complex call routing and voice menus for better customer relationship management and efficiently handle support requests.
- Call recording and monitoring: Record calls automatically or on demand for quality monitoring, training, or compliance. Live call monitoring and “whisper/barge” features enable real-time coaching.
- Integration ready: Easily connects with CRMs, dialers, and third-party tools, center software integrates seamlessly with your existing systems.
3.GOautodial
GOautodial is a free and feature-rich open source omnichannel contact center software provider designed for inbound and outbound calls and blended operations. Built on top of Asterisk and other open technologies, it’s ideal for businesses that need a full-featured, cost-effective call center system with minimal licensing fees.
Key features
- Auto dialer & predictive dialing: Improve agent performance with automatic outbound calls.
- Real-time cloud dashboard: Provides live visibility into call activity, agent performance, and campaign metrics.
- QA scorecard: Enables structures quality assurance evaluations to improve call handling and customer service.
- Web-based agent interface: Easy-to-use dashboard for managing campaigns, agents, and reports.
4. Incredible PBX
Incredible PBX is an open-source PBX platform built on top of Asterisk, designed for small to medium-sized businesses. It provides a ready-to-use telephony solution with robust features for managing voice calls, voicemail, and conferencing. Its pre-configured setup simplifies deployment while offering advanced functionality for business communications.
Key features
- VoIP & PSTN support: Handles both internet-based and traditional phone calls.
- Local control panel: Provides easy, on-site management of the PBX system.
- Open-source add-ons: Extend functionality with numerous free modules and scripts.
- Voice applications included: Pre-installed applications such as voicemail, call recording, and conferencing.
5. Bitrix24
Bitrix24 is a unified business needs platform that includes a free plan for call center software, along with CRM, task management, and team collaboration tools. While it’s not an open source platform, it’s widely used as an all-in-one alternative to traditional call center software and open-source solutions.
It’s a great fit for teams that want voice support built into their workflow system.
Key features
- Automatic lead distribution: Assigns leads to the right agents automatically, improving sales processes.
- Task management tools: Automate call recording and route calls to the right departments.
- Built-in CRM: Improves interactions with integrated sales and support tools.
- Customizable dashboards: Show call quality and agent performance through analytics.
6. FreePBX
FreePBX is a widely used, open-source IP PBX system built on Asterisk. It offers a web-based, user-friendly interface that makes it easier to manage virtual phone systems without deep technical knowledge.
Ideal for small to mid-sized businesses, FreePBX provides strong VoIP service features with flexibility and control.
Key features
- Session border controllers: Ensure your VoIP network is secure with end to end encryption while supporting advanced SIP features and IP connectivity for remote workers.
- Voicemail integration: Easy access to messages, reply, forward, and save options.
- Extensions: Creates individual phone extensions for agents in the center module.
- Modular add-ons: Extend functionality with voicemail, conferencing, reporting tools, and more contact center tools.
7. OMniLeads
OMniLeads (OML) is an open-source software solution designed for managing and operating a contact center using multiple communication channels. It is based on WebRTC technology, which allows agents and supervisors to operate directly from a web browser without needing separate softphone applications, making it perfect for managing inbound operations.
Key features
- Bulk messaging: You can send bulk messages to customers efficiently via SMS, email, or chat.
- White label: Customize the platform branding for your organization or clients.
- Conversational bots: Automate customer interactions with AI-driven chatbots or voicebots.
- CX survey: Collect customer feedback through integrated surveys to measure satisfaction and improve service.
8. VICIdial
VICIdial is a powerful, open-source call center platform specifically designed for inbound, outbound, and blended call recording. Vicidial Group’s VicIhost service, known for its advanced dialing capabilities and scalability, is widely used by call centers around the world, especially those needing a free call center software with enterprise-level features.
Key features
- Three-way calling: Connects multiple parties on a single call for collaboration or escalation.
- Scheduled callbacks: Allows call transfers and calls to be automatically scheduled and returned at convenient times.
- Web-configurable IVRs: Create and manage interactive voice response menus directly from the web interface.
- Inbound email handling: Manages and routes incoming emails alongside calls for seamless multichannel support.
9. FreeSWITCH
FreeSWITCH is a scalable, open-source telephony platform designed to handle voice, video, and text communications. It serves as a flexible alternative to traditional PBX systems and proprietary software, and is widely used in call centers, VoIP applications, and unified communications solutions.
Built for high performance, FreeSWITCH supports large-scale deployments and can integrate with other software via APIs.
Key features
- Multi-protocol support: Works with SIP, WebRTC, and other standard communication protocols.
- Advanced call control: Provides features like call transfer, hold, and conferencing for efficient communication management.
- Conference & media services: Supports high-quality voice and video conferencing with recording and playback.
- Scalable architecture: Handles thousands of simultaneous calls, making it suitable for both small and enterprise-level setups.
10. Issabel
Issabel is a free and open-source call center platform based on Asterisk and FreePBX. It offers a unified communication suite with PBX, CRM, and reporting tools, making it an excellent choice for businesses seeking a self-hosted, customizable virtual phone system without licensing fees.
Key features
- Management reports: Monitors call volume, agent performance, and system health.
- IVR & call queues: Sets up interactive menus and smart distribution to route callers effectively.
- Auto dialer: Automates outbound call campaigns to increase agent productivity.
- Fax: Manages fax communications alongside voice traffic over standard SIP protocols.
Top 5 call center software providers
If you don’t like the idea of using open-source call center software, you can try using contact center software providers.
Here are some of the top call center software providers:
1. KrispCall
KrispCall is a call center software provider offering a cloud-based, AI-powered telephony solution for businesses of all sizes. It facilitates international VoIP calls and other multiple communication channels, such as phone, text, SMS texting, and voicemail.
This allows businesses to establish global contact centers that connect agents and customers across various channels. The software is designed to be user-friendly with an intuitive interface, enabling quick setup and management of call center operations.
Key features
- Multi-level IVR
- Unified Callbox
- AI text message responder
- Custom Caller ID
- Call forwarding
2. AVOXI
AVOXI is a leading provider of call center software solutions, offering a cloud-based PBX system. It specializes in international toll-free numbers and business phone systems. AVOXI is an all-in-one cloud communications platform offering voice services in 150+ countries, 2-way messaging in the US and Canada.
While AVOXI does sell local, toll-free, and international business phone numbers, free users who don’t want to purchase a phone number can port in existing phone numbers or connect their business numbers via compatible third-party integrations.
Key features
- Screen Pops
- Live dashboards
- AI integrations
- Intuitive Call orchestration
- Programmable voice
3. Talkdesk
Talkdesk is a cloud-based call center software provider that utilizes AI to enhance customer service. It offers tools to streamline communication and improve customer outcomes for businesses. Talkdesk is positioned as a modern and innovative solution for customer support teams.
It uses interactive voice response (IVR), automatic call distribution (ACD), and skills-based routing. Callers are routed to the agent most qualified to meet their needs, based on customizable data.
Key features
- Agentic outbound
- Talkdesk Autopilot
- Interaction Analytics
- Knowledge creator
- AI trainer
4. Twilio
Twilio offers a cloud-based contact center solution, Twilio Flex, that allows businesses to deliver a positive customer experience. It provides flexible, programmable APIs for building contact centers, enabling businesses to customize channels and features according to their needs.
This approach allows for personalized support and can drive repeat sales by making it easy for customers to engage with the business.
Key features
- Bring your own carrier
- Google Contact Center AI (CCAI)
- Flex insights
- Intelligent routing
- Omnichannel engagement
5. Zendesk
Zendesk is a call center software provider that can help you route calls, manage rising call volume, and ensure agents meet customer expectations. Zendesk also includes AI-powered agents for faster, personalized support across various channels, including voice.
Additionally, Zendesk offers IVR software for call routing and managing call volume, making it a comprehensive solution for call center operations. It provides features such as automatic call routing and performance insights to help agents manage customer interactions more efficiently.
Key features
- AI agents
- Ticketing
- Messaging and live chat
- Quality assurance
- Workforce management
Conclusion
Choosing the right open-source call center software depends on your business size, needs, and technical resources. Identify essential features like IVR, VoIP, and CRM integration. Smaller teams may need basic tools, while growing businesses should prioritize scalability, advanced routing, and multi-channel support.
Consider ease of setup and integration with existing tools, as well as available support. Aim for software that is affordable, practical, and aligns with your goals. For powerful features without the complexity of self-hosting, a modern cloud solution is ideal.
And for that, KrispCall offers an AI-powered, cloud-based platform that is easy to set up, instantly scalable, and provides advanced features like AI Rephrasing and a Unified Callbox.
Try KrispCall today and effortlessly manage all your customer interactions!
