Top 18 Free Call Center Software Tools to Power Your Support Team

Imagine your small support team facing rising call volume, scattered notes, and a shoestring budget while customers expect fast, personal service. Free call center software can change that by bringing cloud-based contact center tools like Intelligent Call Routing, automatic call distribution, CRM integration, call recording, and analytics, without a big license fee. This article shows how to choose open source or hosted options, tune the agent desktop, use workforce management and predictive dialing, and add omnichannel support to boost efficiency and quality. Want to build a high-performing, efficient, and affordable call center that delivers exceptional customer support without paying for expensive software?

Voice AI’s text to speech tool helps here by turning scripts into natural-sounding voice prompts for IVR, automated outreach, and agent assist, cutting wait times and operating costs while keeping conversations clear and consistent.

What is Open Source Call Center Software?

Open source call center software is a contact center platform whose source code is freely available for anyone to inspect, modify, and redistribute. That transparency means you can:

• Adapt routing rules
• Agent desktops
• IVR flows
• CRM connectors

To match your processes. It handles inbound and outbound voice, chat, and email, provides automatic call distribution, call recording, workforce management, and real-time dashboards. 

Who benefits most from free call center software: 

• Startups
• Nonprofits
• Small businesses
• Any tech-savvy enterprise

Who wants control over costs and features?

What Building One Really Costs

Commercial-grade open source contact center projects require real investment in engineering, testing, and operations. For example, a large development team of 45 engineers might spend 20 to 30 million dollars over five to six years to build a full-featured platform. A much smaller implementation with five practitioners could cost about 3 million dollars over the same time frame. 

Projects commonly adopt permissive licenses such as the Apache license and rely on community contributors, third-party integrators, and commercial support providers for maintenance and extension. How a project is licensed affects whether vendors can bundle support and who can reuse the code.

Why Open Source Beats Proprietary for Many Teams

Open source eliminates recurring licensing fees and gives you the freedom to change routing logic, IVR scripts, and agent workflows without waiting for a vendor roadmap. You gain flexibility to:

• Integrate CTI
• SIP trunking
• Cloud contact center modules
• AI services

Community contributions accelerate innovation on features like predictive dialer, softphone, and omnichannel routing. You also reduce vendor lock-in because you own the code and can bring work in-house or to another integrator. What does that mean for your budget and roadmap?

How It Powers Customer Service and Support

Open source call center platforms run inbound help desks, outbound sales and collections, and blended contact center operations. Use intelligent call routing and skills-based routing to send each inquiry to the best available agent. Tie agent desktops to your CRM so customer history and support tickets appear before the call connects. 

Support omnichannel interactions by linking voice, chat, SMS, and email threads into a single conversation view. Need to handle peak seasonal traffic or launch a new campaign quickly?

Scalability and Handling Peak Traffic

Architectures scale from a handful of agents to thousands by adding application servers, media servers, and redundant databases. Real-time reporting, queue monitoring, and load balancing keep service levels steady under load. 

Core metrics you should track include:

• Call analytics: measures call volume, queue depth, and response times in real time.
• Real-time reporting: live dashboards for supervisors to act on active queues.
• Customizable reporting: tailored exports for KPI, SLA, and trend analysis.
• Scalable architecture: ability to add media and application capacity without major redesign.

Supervisors use real-time dashboards and alerts to reroute overflow or spin up additional trunks while callers are still waiting.

Make It Yours: Customization and Flexibility

Open source lets you build custom agent scripts, automate repetitive tasks, and add AI for routing and transcription. Platforms like ViciDial demonstrate how automations reduce manual work and cut handle time by:

• Automating callbacks
• Campaign scheduling
• Disposition workflows

You can extend the platform with speech-to-text, sentiment detection, or a recommendation engine that surfaces knowledge base articles on screen. Which of your workflows would benefit from automation?

Connect Everything: CRM and System Integration

Seamless CRM integration ensures agents see case histories, order details, and payment status when the call starts. Open source solutions generally support standard integration methods such as REST APIs, webhooks, CTI connectors, and database-level syncs. 

Examples of software and typical trade-offs:

• CallHippo: CRM integration, call routing, easy setup; pros include commercial support and simple agent setup; cons include interface preferences that may not suit every team.
• Asterisk: auto dialer, reporting, call monitoring; pros include deep integration options and a large developer base; cons include a steeper technical setup for complex deployments.

Use CTI bridges, SIP trunking, and middleware to make CRM records appear on the agent desktop the moment a call arrives.

Measure What Matters: Reporting and Analytics

Reporting tools turn voice analytics, call transcripts, and agent KPIs into coaching actions. 

Track these metrics:

• Voice analytics: call volume, peak times, and average hold durations.
• Average handling time AHT: average time spent resolving a contact.
• First call resolution FCR: percent of issues closed on first contact.
• Customer satisfaction CSAT: direct survey feedback after interactions.
• Net promoter score NPS: measure of customer loyalty and referral intent.
• AI-powered transcripts: keyword spotting, coaching flags, and compliance checks.

These data points inform staffing models, training priorities, and optimization of scripts and IVR menus.

Inbound and Outbound Operations Covered

Open source contact center software supports traditional inbound playbooks and outbound campaign workflows. For inbound work use skills-based routing, callback queues, and priority routing for VIP customers. For outbound work use auto dialer or predictive dialer engines, campaign management, and call pacing controls to meet legal requirements.

 Integration with CRM enables personalized scripts, scheduling, and automatic disposition recording after each call. How will you balance inbound SLAs with outbound targets?

Agents, Supervisors, and Operations Tools

Agent desktops provide click-to-dial, call control, call notes, and access to knowledge base content. Supervisors get real-time monitoring, call barging, and coaching tools. 

Operations teams use workforce management and shift scheduling to match agent supply to demand. Call recording and quality management store interactions for audits and training, ensuring adherence to compliance rules.

Security, Compliance, and Support Options

Open source projects can follow secure development practices, encrypt media streams, and support role-based access control. Compliance for PCI, HIPAA, and local call recording laws requires configuration and audit trails. 

If you prefer commercial support, vendors offer managed services, SLA backed hosting, and integration services that combine open source flexibility with professional guarantees.

Installation Models: Cloud or On-Premise

Deploy on-premises for tighter control of data and latency-sensitive media. Deploy in the cloud for faster scaling, global trunking, and integrated contact center as a service capabilities. Hybrids let you keep sensitive data internal while outsourcing media or analytics services.

Implementation Considerations and Total Cost of Ownership

Total cost includes:

• Engineering
• Integrations
• Testing
• Telephony costs
• Hosting
• Ongoing maintenance

Open source reduces licensing costs but requires investment in people or a trusted partner to deploy, secure, and operate the system. Budget for initial development, training, and continuous improvement cycles to ensure the system remains reliable and compliant.

Want a quick checklist to compare options for a proof of concept or pilot?

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18 Free Call Center Software Picks to Streamline Your Operations

1. Voice AI

Voice AI (Voice.ai) offers a free tier and trial for its text-to-speech tool that generates natural, human-like voices for narration and voiceovers. It converts text into expressive speech, supports multiple languages, provides a library of AI voices, and integrates with content workflows for video, eLearning, and apps. 

Best For

• Content creators
• Developers
• Educators
• Small teams 

Pros

• Rapid turnaround
• Emotional nuance
• Multi-language support 

Limitations

Quality varies by voice selection, and integration may require developer work.

2. Asterisk

Asterisk is free and open source software that functions as a programmable PBX and call center management engine, offering IVR, automatic call distribution, SIP trunking, and CRM integration. It handles inbound and outbound routing, real-time monitoring, call recording, and custom dialplan development for tailored workflows. 

Best For

• Businesses from startups to large enterprises that want on-premise control and customization. 

Pros

• Extreme flexibility
• A large community for extensions

Limitations

• It has a steep learning curve and requires telephony expertise to secure and scale.

3. FreeSWITCH

FreeSWITCH is an open source communications platform focused on high voice and video quality, modular architecture, and performance at scale. It provides SIP-based call routing, conferencing, media transcoding, and APIs for integration with CRMs and analytics. 

Best for

• Service providers, carriers, and large contact centers that need reliable high-volume call handling. 

Pros

• Efficient use of resources and strong HD audio/video capabilities

Limitations

• This setup offers a more complex configuration and fewer turnkey contact center features than some commercial suites.

4. VICIdial

Vicidial is free and open source contact center software known for auto-dialing, predictive and progressive dialing, inbound ACD, call recording, and multichannel outreach. It tracks campaigns, provides agent scripting, and delivers real-time agent monitoring and reports. 

Best For

• Medium to large call centers running outbound campaigns or blended operations. 

Pros

• Proven at scale with many installations and measurable productivity gains

Limitations

• The interface and user experience feel dated
• Administrators need telecom and Linux skills.

5. Issabel

Issabel is an open source unified communications platform that bundles telephony, IVR, call recording, and basic contact center features into an accessible UI. It simplifies setup for PBX, voicemail, conferencing, and CRM links for SMB deployments. 

Best for

• Small to medium teams that prefer an on-premise
• User-friendly interface and active community

Limitations

• Fewer advanced contact center analytics and workforce management tools compared with enterprise offerings.

6. Elastix

Elastix is open source software that integrates voice, video, messaging, and conferencing alongside call routing, IVR, and PBX functions. It supports CRM integration and reporting to help agents access customer context during calls. 

Best For

• Small to mid-sized companies seeking an all-in-one communications platform. 

Pros

• Consolidates multiple communication channels and reduces tool sprawl

Limitations

• Development activity shifted to forks, so long-term support varies by distribution.

7. GOautodial

GOautodial is a free, open source call center system built around predictive dialing, real-time monitoring, call recording, and campaign management for outbound operations. It emphasizes automation to reduce agent idle time and includes quality monitoring and CRM hooks. 

Best For

• Contact centers driving large outbound campaigns or blended inbound/outbound teams. 

Pros

• Strong dialer features and rapid deployment

Limitations

• Resource demands under heavy load and administrative expertise needed for optimization.

8. Odoo CRM

Odoo CRM combines CRM, sales automation, and VoIP call capabilities. The core community edition is open source, with optional paid modules available. It adds click-to-call, call logging, and pipeline management, which are tied to customer records, so agents see context during calls. 

Best For

• Growing businesses that want tight alignment between sales, support, and contact center activity. 

Pros

• Centralized customer data and automation that reduce manual work

Limitations

• Advanced call center features often require paid modules or custom development.

9. Bitrix24

Bitrix24 offers a generous free tier and cloud or self-hosted options for CRM, telephony, and contact center features like IP telephony, IVR, and omnichannel messaging. It bundles team collaboration, task management, and reporting into a single platform for small and medium businesses. 

Best For

• Startups and SMBs that need CRM-linked call handling and remote team collaboration. 

Pros

• Low-cost entry and broad feature set

Limitations

• Limits on free users and storage, along with advanced reporting, can require paid plans.

10. FreePBX

FreePBX is free and open source software that provides a web GUI for managing Asterisk PBX features like IVR, ring groups, call queues, and voicemail. It simplifies PBX and contact center configuration while supporting modules for call recording, conference rooms, and SIP trunks. 

Best For 

• Businesses of any size wanting Asterisk power without direct dialplan coding. 

Pros 

• Easier administration and modular extensions

Limitations

• The module ecosystem includes paid add-ons and security hardening is essential.

11. EKIGA

Ekiga is free and open source softphone software providing SIP-based voice and video calls, call transfer, call forwarding, and LDAP address book access. It supports HD audio, echo cancellation, and basic call monitoring for small teams and remote agents. 

Best For

• Small call centers and remote workers who need a lightweight desktop softphone. 

Pros

• Low overhead and standard codec support

Limitations

• Limited contact center feature set and development activity is light.

12. OrekaGPL

OrekaGPL is a free call recording software focused on passive capture of VoIP and sound device audio, with web retrieval and support for database storage. It offers voice activity detection, archiving, scheduled recording, and fundamental indexing for quality and compliance programs. 

Best For

• Call centers that need reliable recording and storage without licensing costs. 

Pros

• Quick install and adaptable capture back end

Limitations

• The user interface and analytics are basic compared with commercial QA suites.

13. Linphone

Linphone is open source VoIP/SIP software for desktop and mobile that delivers HD voice and video, call recording, encryption via SRTP and ZRTP, and remote provisioning. It works well for call centers that deploy softphones across agents and need consistent SIP compatibility. 

Best For

• Organizations want standards-based clients and secure call transport. 

Pros

• Strong codec support and security

Limitations

• Not a complete contact center platform and requires integration with PBX and CRM.

14. ICTBroadcast

ICTBroadcast is open-source autodialer software that handles VoIP, FoIP, and PSTN calling, with features such as campaign management, bulk messaging, call recording, and dashboards. It supports mixed dialing modes and quick data import for rapid campaign launches. 

Best For

• Marketing teams and contact centers are running prominent outbound voice and SMS campaigns.

Pros

• Built-in campaign controls and reporting

Limitations

• Setting up and scaling need careful infrastructure planning.

15. MicroSIP

MicroSIP is free SIP client software for Windows that offers high-quality VoIP calls, echo cancellation, voice activity detection, and call encryption. It uses minimal system resources and supports multiple accounts for small teams. 

Best For

• Small call centers and remote agents using Windows machines need a simple softphone. 

Pros

• Low CPU footprint and straightforward setup

Limitations

• Limited advanced contact center features and platform is Windows only.

16. VMukti 1.1

VMukti 1.1 is an open source call center solution that provides inbound and outbound support with predictive, preview, progressive, and broadcast dialing, as well as ACD, IVR, and agent monitoring. It includes call detail records, reporting, and web-based agent screens for campaign management. 

Best For

• Mid-size contact centers that require multiple dialer modes and integration with databases. 

Pros

• Broad dialing options and reporting

Limitations

• There are older releases and a smaller community for updates.

17. ActiveDemand

ActiveDemand offers a free single-user option and paid tiers; it pairs call tracking with marketing automation, campaign analytics, SMS, and lead distribution for cross-channel attribution. It tracks caller behavior across pages and links, attaches call data to leads, and supports automated routing and reporting. 

Best For

• Marketers and small teams that need deep call attribution and campaign-level insights. 

Pros

• Rich analytics and multi-channel campaign orchestration

Limitations

• Feature depth creates a learning curve
• Full functionality requires paid plans.

18. Crazy Call

Crazy Call provides a free plan with features such as auto dialer, call scripting, call recording, live monitoring, dashboards, and report exports for sales teams. It includes IVR routing, scheduling, conference calling, and virtual phone numbers for campaign flexibility. 

Best For

• Small sales teams and SMBs focused on outbound calling and cold outreach. 

Pros

• Focused workflow for sales with useful telemetry

Limitations

• There are free limits on capacity and advanced telephony controls compared with larger platforms.

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How to Set Up Your Call Center Using Free and Open Source Software

A call center centralizes customer contacts, handling both inbound and outbound voice calls and other channels when needed. It can live inside your company or run through a third party that specializes in customer service and telephony. What do you want your center to handle today, voice only or omnichannel with chat and email?

Three Types That Shape How You Staff and Route Calls

1. Inbound Call Centers: Handle High Incoming Volume

Inbound centers answer customer calls. An IVR greets callers and then uses ASR or keypad options to collect intent before routing to a live agent. Automatic call distribution and queue management keep hold times lower and route callers by skill or priority.

2. Outbound Call Centers: Agents Initiate Contact

Outbound centers place calls to leads or customers for sales, surveys, renewals, or appointment reminders. Systems here often use auto dialers or predictive dialers to boost efficiency while managing compliance with do-not-call rules.

3. Blended Call Centers: Mix Inbound and Outbound Work

Blended setups let agents switch between incoming calls and outbound campaigns. This improves utilization across slow and busy periods and enables you to shift labor to where demand is highest.

Telecom Network: Connect the Calls

Your network needs reliable PSTN or VoIP connectivity via SIP trunks or PBX gateways. Routers and switches should support quality of service for voice and stable internet bandwidth to avoid jitter and packet loss. Consider a session border controller to protect SIP traffic and to manage NAT issues.

Hardware: What Agents and Servers Require

Agents need desktops or thin clients, along with quality headsets or VoIP phones. You may run PBX servers or telephony cards if you use analog trunks. Plan for dedicated servers for call recording and for any IVR engines you host.

Software: The Brains That Automate Workflows

Choose an operating system and core packages such as Linux with Asterisk, FreeSWITCH, or a complete distribution like VICIdial or ICTBroadcast. Add CRM systems such as SuiteCRM or SugarCRM, databases for logging, and reporting tools for analytics and dashboards.

Free Call Center Software Options That Keep Costs Low

Open source call center software reduces licensing spend while offering robust features. Popular choices include Asterisk and FreeSWITCH for SIP and PBX control, and VICIdial for predictive dialing and campaign management. ICTBroadcast can run voice and IVR campaigns. Use these with a CRM to enable CTI screen pops and agent desktop integration.

1. Choose and Install Software

Pick the platform that matches your needs. Asterisk or FreeSWITCH handles telephony core functions. VICIdial adds outbound campaign tools and predictive dialing. Install on a Linux server, virtual machine, or container and harden the OS with secure user accounts and firewall rules.

2. Configure Telephony Hardware and SIP Trunks

Attach telephony cards for analog lines or register with SIP trunk providers for PSTN termination. Use TLS for SIP signaling and SRTP for media when possible. Open required ports on your firewall and set up NAT traversal or a session border controller.

3. Create Extensions for Every Agent

Provision SIP extensions for each agent and for system elements such as IVR, queues, and supervisors. Use templates to speed deployment and lock down credentials to prevent unauthorized registration.

4. Set Up Call Routing and IVR

Design IVR menus that collect caller intent quickly and direct calls to the correct queue or agent skill group. Implement time-of-day routing and fallback paths for overflow or after-hours.

5. Configure Call Queues and ACD

Define queue behavior, including hold music, estimated wait announcements, queue priorities, and callback options. Set skill-based routing so agents handle calls that match their expertise.

6. Enable Call Recording and Logging

Turn on recording per campaign or per queue and separate files by call id. Plan storage and retention policies to meet legal and compliance needs. Index recordings in your database for search and quality review.

7. Integrate CRM and Enable CTI

Connect your call center platform to SuiteCRM or SugarCRM via API or webhooks to enable screen pops, click-to-dial, and automatic call logging. CTI links reduce handle time and improve agent context.

8. Test the Setup Thoroughly

Run test calls for inbound, outbound, transfers, and IVR flows. Verify call recording, CRM data passing, and queuing under load. Do user acceptance tests with agents and supervisors to catch practical issues.

9. Train Agents on Tools and Procedures

Provide hands-on sessions for softphone usage, CRM workflows, call scripting, and escalation paths. Train agents on compliance areas such as consent for recording and handling payment card data.

10. Monitor, Update, and Maintain

Implement monitoring for SIP registrations, call quality metrics, CPU and disk usage, and call failure rates. Apply software updates on a maintenance schedule and keep secure backups of configuration and call logs.

Security and Compliance Practices That Protect Data

Use TLS and SRTP to secure signaling and audio streams. Encrypt recordings at rest and control access through role-based permissions. If you handle payments, use an external PCI-compliant gateway or a tokenization service to avoid storing card data in call logs.

Call Quality and Performance Monitoring

Track MOS scores, jitter, packet loss, and dropped calls. Use dashboards for real-time agent status and historical reporting for service level adherence and agent performance. Which metrics will you prioritize first?

Cost Saving Deployments and Scaling Options

Start with open source tools on modest servers and add SIP trunk minutes from low-cost providers. Consider cloud contact center options when you need rapid scaling and elastic pricing. Reuse existing PCs as thin clients and favor softphones to cut hardware spend.

Reporting, Workforce Management, and Optimization

Set up call analytics and reporting that show SLA, average handle time, first call resolution, and abandonment rates. Use workforce management to forecast staffing needs, plan schedules, and manage shrinkage and breaks.

Common Automation Features to Look For

Look for IVR, predictive dialer, auto attendant, callbacks, CRM screen pops, and omnichannel routing. These features reduce manual steps and help agents focus on resolving customer needs.

Troubleshooting the Phone System Rapidly

When calls fail, check SIP trunk status, registration logs, firewall rules, and NAT. Use packet captures for RTP issues and look at system logs for authentication errors to find the root cause quickly.

Which Open Source Platform Fits Your Needs?

Ask whether you need heavy outbound dialing or simple inbound routing. Asterisk and FreeSWITCH suit core telephony and custom IVR, while VICIdial or ICTBroadcast simplify campaign management and predictive dialing. What will your call volume and agent mix look like next quarter?

Try our Text to Speech Tool for Free Today

Voice AI turns plain text into natural human speech that carries emotion and character. Use it for voiceovers, narration, training modules, or spoken feedback in apps. Content creators get professional audio fast. Developers get an SDK and API for seamless integration into apps, IVR systems, and virtual agents. Educators produce clear multilingual lessons without hiring voice talent.

How Our Voices Sound Human and Expressive

Our neural voices use advanced speech synthesis and natural language processing to create cadence, emphasis, and subtle pauses. The output does not sound robotic. You can control pitch, speed, and intonation to match a brand or lesson plan. Want a warm customer service tone for your contact center or a bright narrator for video tutorials? The tool adapts.

Multiple Languages and Global Reach

Choose from many languages and regional accents to serve global audiences. Multilingual TTS supports language detection and consistent pronunciation across dialects. This helps contact centers offering support in several countries and e learning platforms that need localized audio.

Developer Tools and Integration Options

Voice AI provides a simple REST API, SDKs for major languages, and developer documentation for quick prototyping. Integrate text to speech into cloud contact center platforms, softphones, or PBX systems via SIP trunking. Use our webhooks and callbacks to stream audio into live calls, record sessions, or feed speech to text engines for monitoring.

Why Call Centers and Contact Centers Benefit

Need a natural voice for IVR prompts or outbound messages? Voice AI improves caller experience and reduces friction. Replace generic prerecorded prompts with expressive recordings that reflect agent tone. Pair TTS with automatic call distribution, call routing, and CRM integration to create smarter self-service flows and lower average handle time.

Compatibility With Free Call Center Software Options

Teams using free call center software, open source contact center suites, or cloud contact center trials can add professional TTS without changing core systems. Our REST API and standard audio formats work with most agent desktop tools, ACD modules, and predictive dialers. This keeps implementation simple while upgrading IVR, voicemail, and outbound dialing audio.

Analytics, Monitoring, and Quality Assurance

Generate call recordings and transcripts for analytics, quality assurance, and training. Combine speech to text and sentiment analysis to spot trends in customer calls. Use reporting dashboards to track usage, cost per minute, and performance across channels like voice, chat, and email.

Security, Compliance, and Data Handling

We use encryption in transit and at rest. Deployments support hosted cloud and on-premises models to meet regulatory needs. Integration supports secure authentication for APIs and role-based access to audio assets and logs, which helps contact centers maintain PCI and HIPAA considerations when required.

Pricing, Free Trial, and Getting Started

Try the text to speech tool for free to evaluate voice quality and integration workflow. Free trials let you generate sample audio, test multilingual output, and connect a development environment to our API. Choose usage-based plans or enterprise licensing for bulk outbound needs and workforce management scale.

Use Cases That Make Sense for Your Team

Are you producing training modules for agents, creating on-hold messaging, or automating follow-up calls? Voice AI fits each scenario. It helps marketers produce faster video voiceovers, helps developers build voice-enabled apps, and helps educators create clear audio lessons in minutes.

Support, Onboarding, and Implementation Help

We offer documentation, sample code, and developer forums. For contact center automation projects, we provide integration guides for IVR systems, ACD platforms, and CRM connectors. Need custom voice tuning or a dedicated account engineer? Those services are available to accelerate deployment.

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