Freedom251 › Business Phone Systems
OPBX
What OPBX is
OPBX is a free, open-source, multi-tenant business PBX built on Cloudonix CPaaS. It routes DID calls to extensions, ring groups, IVRs, business-hours rules, conference rooms, AI assistants, and AI load balancers. AI load balancers can distribute calls by round robin, priority, or percentage and fail over to another assistant. Inbound blacklists and outbound whitelists control unwanted calls and destinations. The outbound auto dialer supports scheduled campaigns, concurrent-call and call-speed limits, voicemail detection, retries, and real-time monitoring. Organizations are isolated for service-provider use, with Owner, PBX Admin, PBX User, and Reporter roles. Cloudonix handles VoIP and SIP services through a domain UUID, API key, and public webhook URL. The REST API has OpenAPI 3.1.0 documentation. Docker Compose is recommended, with minimum requirements of 4 GB RAM and 20 GB disk space.
Who it suits
It suits service providers and organizations needing multi-tenant PBX routing, campaigns, role controls, and AI call handling. Deployment requires Cloudonix CPaaS configuration and the documented system resources.
What it does well
- Supports isolated multi-tenant organizations
- Includes AI call distribution and failover
- Auto dialer offers campaigns and monitoring
- Provides role-based access controls
- Free and open source
What to know first
- VoIP and SIP services depend on Cloudonix CPaaS
- Auto Dialer is limited to Owners and PBX Admins
- Minimum deployment requirements include 4 GB RAM
- Requires Docker Compose for recommended deployment
Verdict
OPBX combines PBX routing, outbound campaigns, tenant isolation, and AI call distribution in an open-source platform. Its Cloudonix dependency and deployment requirements should be considered during setup.
Facts from OPBX's own pages
- Access controls
- The platform has Owner, PBX Admin, PBX User, and read-only Reporter roles, with tenant data isolation. · developers.cloudonix.com, 13 Oct 2026
- AI routing
- AI load balancers can distribute calls by round robin, priority, or percentage and can fail over to another assistant. · developers.cloudonix.com, 13 Oct 2026
- API
- The OPBX REST API is documented with OpenAPI 3.1.0. · developers.cloudonix.com, 13 Oct 2026
- Call handling
- It routes calls to extensions, ring groups, IVRs, business hours, conference rooms, AI assistants, and AI load balancers. · developers.cloudonix.com, 13 Oct 2026
- Call routing
- custom · github.com, 22 Sept 2026
- Call security
- Inbound blacklisting supports exact, prefix, or wildcard caller matching; outbound whitelisting restricts destinations by country and prefix. · developers.cloudonix.com, 13 Oct 2026
- Deployment
- OPBX can be installed with Docker Compose; the guide recommends at least 4 GB RAM and 20 GB disk space. · developers.cloudonix.com, 13 Oct 2026
- Dialer
- The outbound auto dialer supports scheduled campaigns, concurrent-call and call-speed limits, voicemail detection, retries, and real-time monitoring. · developers.cloudonix.com, 12 Oct 2026
- Free access
- The maker invites users to open a free OPBX Cloud testing account. · developers.cloudonix.com, 13 Oct 2026
- Free plan
- Yes · github.com, 22 Sept 2026
- Integration
- OPBX delegates VoIP call handling and SIP services to Cloudonix CPaaS, configured with a domain UUID, API key, and public webhook URL. · developers.cloudonix.com, 12 Oct 2026
- Integrations
- OPBX uses Cloudonix CPaaS for call handling and SIP services, and supports AI assistants configured over SIP or WebSocket. · developers.cloudonix.com, 13 Oct 2026
- Multi-tenant use
- The platform supports isolated organizations and is designed to let service providers manage multiple organizations. · developers.cloudonix.com, 12 Oct 2026
- Operational limits
- The Auto Dialer is available only to Owners and PBX Admins. · developers.cloudonix.com, 12 Oct 2026
- Outbound campaigns
- Its auto dialer supports scheduled campaigns, call-rate limits, voicemail detection, retries, and real-time monitoring. · developers.cloudonix.com, 13 Oct 2026
- Product
- OPBX is an open-source, multi-tenant business PBX platform built on Cloudonix CPaaS. · developers.cloudonix.com, 12 Oct 2026
- Roles
- The documented roles are Owner, PBX Admin, PBX User, and Reporter, with different access permissions. · developers.cloudonix.com, 12 Oct 2026
- Security
- The security guide describes Laravel Sanctum authentication, CSRF protection for browser sessions, and role-scoped API tokens that expire after 24 hours. · developers.cloudonix.com, 13 Oct 2026
- Support
- Cloudonix offers support through its ticketing system and Discord community. · developers.cloudonix.com, 13 Oct 2026
- What it is
- OPBX is an open-source, multi-tenant business PBX built on Cloudonix CPaaS. · developers.cloudonix.com, 13 Oct 2026
Where OPBX stands on Freedom251
- Business Phone Systems#30 of 167