OPBX

6.4easy start · #143of 174
in Business Phone Systems

Well documentedyes
Runs where you workno

Runs on api, Linux, self-hosted, Web.

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OPBX is ranked #143 of 174 in business phone systems on The Geeks Club. It runs on API, Linux, Self-hosted, Web.

Compared on business phone systems

Free plan: Yes
Call routing: custom

Best OPBX alternatives

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The record

Product: OPBX is an open-source, multi-tenant business PBX platform built on Cloudonix CPaaS.
Call handling: It routes DID calls to extensions, ring groups, IVRs, business hours, conference rooms, AI assistants, and AI load balancers.
Call security: Inbound blacklists and outbound whitelists provide controls for unwanted calls and destinations.
Dialer: The outbound auto dialer supports scheduled campaigns, concurrent-call and call-speed limits, voicemail detection, retries, and real-time monitoring.
AI routing: AI load balancers distribute incoming calls by round robin, priority, or percentage and can fail over to another assistant.
Multi-tenant use: The platform supports isolated organizations and is designed to let service providers manage multiple organizations.
Roles: The documented roles are Owner, PBX Admin, PBX User, and Reporter, with different access permissions.
Integration: OPBX delegates VoIP call handling and SIP services to Cloudonix CPaaS, configured with a domain UUID, API key, and public webhook URL.
API: The OPBX REST API is documented with OpenAPI 3.1.0.
Security: The security documentation describes role-scoped API tokens that expire after 24 hours and encrypted Cloudonix API keys.
Deployment: The installation guide recommends Docker Compose for production and local development, and lists minimum requirements of 4 GB RAM and 20 GB disk space.
Operational limits: The Auto Dialer is available only to Owners and PBX Admins.
Support: The maker offers support through a ticketing system and a Discord community.
Free access: The OPBX page invites users to open a free OPBX Cloud testing account.

Where it ranks on The Geeks Club

Best Business Phone Systems in 2026#143 of 174

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Sources

developers.cloudonix.com/opbx· checked 12 Oct 2026
developers.cloudonix.com/opbx/applications/auto-dialer· checked 12 Oct 2026
developers.cloudonix.com/opbx/applications/ai-load-balancers· checked 12 Oct 2026
developers.cloudonix.com/opbx/administration· checked 12 Oct 2026
developers.cloudonix.com/opbx/architecture/security· checked 12 Oct 2026
developers.cloudonix.com/opbx/installation· checked 12 Oct 2026
developers.cloudonix.com/opbx/· checked 12 Oct 2026