An auto dialer is a software application that automatically dials phone numbers and connects calls to agents, IVR systems, or prerecorded messages. Auto dialers are widely used by call centers, sales teams, customer support departments, and enterprises running outbound campaigns such as lead generation, surveys, appointment reminders, and alerts.
With rising operational costs and growing demand for scalable communication systems, open source auto dialer software has become a preferred choice for businesses of all sizes. Open source unified communication solutions provide flexibility, customization, and cost efficiency while allowing organizations to maintain full control over their telephony infrastructure.
This article highlights the 10 best open source auto dialer software solutions, comparing their core features, strengths, and ideal use cases—based on current industry adoption and technical capabilities.
Why Choose Open Source Auto Dialer Software?
Open source auto dialers offer several strategic advantages over proprietary systems:
- Low or zero licensing cost
- Full access to source code
- Customizable call flows and dialing logic
- Easy integration with CRM, ERP, and third-party applications
- Vendor independence
- Scalability for growing call volumes
These benefits make open source dialers ideal for startups, SMBs, developers, and enterprises seeking long-term flexibility.
1. ICTDialer (FreeSWITCH-Based Auto Dialer)
ICTDialer is one of the most powerful and developer-friendly open source unified auto dialer, voice, fax, & sms broadcasting platforms available today. Built on FreeSWITCH and powered by the ICTCore communication framework, ICTDialer is designed for high-performance outbound campaigns and deep system integrations.
Key Features
- Predictive, progressive, preview, and IVR dialing
- FreeSWITCH-based high concurrency architecture
- REST APIs for CRM and third-party integration
- Multi-tenant and multi-campaign support
- Call routing, IVR, and agent-based campaigns
- Highly customizable for developers and integrators
Why ICTDialer Stands Out
ICTDialer is ideal for businesses that need full control, customization, and scalability. Its API-first design makes it perfect for building custom communication solutions, SaaS platforms, and integrated call center systems.
2. OSDial
OSDial is a mature open source auto dialer built on the Asterisk platform. It is well known for its stability and traditional predictive dialing capabilities.
Key Features
- Predictive and progressive dialing
- Agent and campaign management
- Call recording and monitoring
- Asterisk-based architecture
Ideal For
Organizations already familiar with Asterisk and looking for a classic predictive dialer solution.
3. Newfies-Dialer
Newfies-Dialer is a FreeSWITCH-based open source voice broadcasting and auto dialing platform. It is mainly used for automated outbound calling and notification systems.
Key Features
- Voice broadcasting and IVR campaigns
- FreeSWITCH-based scalability
- REST API support
- Multi-language support
Ideal For
Survey campaigns, voice alerts, and automated notification systems.
4. VICIdial
VICIdial is one of the most popular open source predictive dialers in the call center industry. It is built on Asterisk and widely used for large outbound operations.
Key Features
- Predictive, progressive, and manual dialing
- Call recording and monitoring
- Agent performance reports
- Web-based interface
Ideal For
Large call centers needing high-volume outbound dialing.
5. GoAutoDial
GoAutoDial is a VICIdial-based open source call center suite that simplifies deployment and management.
Key Features
- Predictive dialing
- Easy installation packages
- Agent and campaign management
- Real-time reporting
Ideal For
Businesses that want VICIdial capabilities with simpler setup.
6. WombatDialer (Community Edition)
WombatDialer is an outbound dialing engine that integrates with Asterisk-based systems.
Key Features
- Predictive and progressive dialing
- Campaign scheduling
- CRM integration support
- API-based control
Ideal For
Developers needing a dialer engine rather than a full call center UI.
8. Asterisk Auto Dialer (Custom Open Source Builds)
Many organizations build custom auto dialers directly on Asterisk, using open source dial plans and scripts.
Key Features
- Fully customizable
- Lightweight deployments
- Direct PBX control
Ideal For
Technical teams requiring custom logic and minimal overhead.
9. FreeSWITCH Custom Auto Dialer
FreeSWITCH is widely used to build high-performance custom auto dialer solutions.
Key Features
- High concurrency
- Advanced call routing
- Event Socket and API control
- WebRTC compatibility
Ideal For
Enterprises and SaaS providers needing carrier-grade scalability.
10. Twilio Open Source Dialer Frameworks
While Twilio itself is commercial, several open source autodialer frameworks exist that use Twilio APIs.
Key Features
- Cloud-based calling
- Easy global connectivity
- API-driven campaign control
Ideal For
Developers wanting cloud telephony with open source logic.
How to Choose the Right Open Source Auto Dialer?
Before selecting an auto dialer, consider:
- Call volume and concurrency requirements
- Asterisk vs FreeSWITCH preference
- Need for APIs and integrations
- Multi-tenant or SaaS requirements
- Technical expertise available in-house
Conclusion
Open source auto dialer software continues to be a powerful alternative to expensive proprietary solutions. With flexibility, scalability, and integration capabilities, these platforms empower businesses to design communication systems tailored to their exact needs.
Among all available options, ICTDialer stands out as a modern, FreeSWITCH-based, API-driven auto dialer, making it an excellent choice for developers, integrators, and businesses looking for future-ready outbound communication solutions.