Open source PBX

A carrier-grade phone system where you control the code, the data, and the infrastructure.

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Why open source matters for your phone system?

Traditional PBX vendors lock you into proprietary hardware, closed ecosystems, and unpredictable licensing costs. Every upgrade, every new feature, every additional user comes with a price tag and a dependency on a single vendor’s roadmap.

Quobis takes a radically different approach. Our PBX solution is built entirely on open source software.

  • No vendor lock-in. The core is FusionPBX, your phone system is not hostage to a single vendor’s business decisions.
  • Deploy anywhere. On-premises, private cloud, any public cloud (AWS, Azure, GCP), or hybrid.
  • Own your data. Call records, recordings, user data everything stays where you decide.
  • Full auditability. Open source means you can inspect every line of code. Essential for regulated industries, government, and defence.
  • BYOC (Bring Your Own Carrier). Connect your existing SIP trunks and negotiate directly with any telecom operator.
  • Reduce hardware costs. Replace expensive desk phones with software clients or keep your existing SIP phones.
  • Predictable costs. No surprise license renewals, no forced migrations to new versions.
  • Survivability: On-premises and hybrid deployments keep your dial tone alive even when internet connectivity is lost. Cloud deployments rely on Kubernetes-native high availability and geo-redundancy to maximize uptime.
  • Kubernetes-native: Containerized architecture with auto-scaling, high availability, and zero-downtime upgrades.
  • Proven at scale: Already running in mission-critical environments. Built to handle your growth without re-platforming.
Who is it for?

For organizations where voice is critical infrastructure

  • Telecom
    Operators

    Offer cloud PBX as a managed service to your enterprise customers. Multi-tenant, white-label, carrier-grade.

  • Public Administration

    Sovereign communications platform that meets data residency, auditability, and accessibility requirements.

  • Enterprises

    Replace proprietary PBX systems with a flexible, cost-effective solution that integrates with Teams and existing SIP infrastructure.

  • Regulated Industries

    Banking, healthcare, defence, where code auditability, data control, and on-premises deployment are mandatory.

  • System Integrators & Resellers

    Bundle Quobis PBX with your services. Full API, white-label support, and flexible commercial models.

Complete PBX functionality

Everything you need from a professional phone system, without the proprietary tax:

Auto-attendant (IVR)

Design multi-level voice menus to route callers automatically.

Call queues

Distribute incoming calls across teams with sequential, simultaneous, or round-robin strategies.

Ringing groups

Distribute incoming calls across teams with sequential, simultaneous, or round-robin strategies.

Voicemail

Per-user voicemail with notification and management.

Call forwarding & transfer

Direct and assisted transfers, conditional forwarding.

Call recording

Record calls for compliance, training, or quality assurance

Dial plan management

Full control over inbound and outbound routing rules.

Time-based conditions

Route calls differently by time of day, day of week, or holidays.

Boss-assistant mode

Executive call screening and delegation

Music on hold

Customizable audio for callers on hold.

Do Not Disturb

Per-user availability management.

Three-way calling

Conference calls without external tools.

Short Dialing

Internal extension-based calling.

CDR & Analytics

Detailed call records at system, domain, and per-user level.

Management

FusionPBX built-in web admin.

Deploy it your way

You get the transparency and flexibility of open source with the reliability of a commercial platform.

SaaS

Hosted and managed by Quobis. Zero infrastructure. Ready in hours.

Private cloud

Dedicated instance in the cloud of your choice (AWS, Azure, GCP), managed by Quobis.

On-premises

Full deployment in your data center. Quobis provides support and updates.

Hybrid

Combine cloud management with on-premises survivability for critical sites.

Migrate at your own pace

Whether you’re replacing an end-of-life PBX or just extending it with new capabilities, this Open Source PBX fits into your existing infrastructure from day one.

Full replacement

Replace your legacy PBX entirely. Migrate users, dial plans, and SIP trunks to FusionPBX and retire the old system. Ideal when your current PBX has reached end-of-life or licensing costs have become unsustainable.

Coexistence with your existing PBX

Migrate teams one at a time. Phased rollout. No big-bang cutover, no service disruption.

20 years of telecom engineering

Ready to take control of your phone system?

Built on proven open source

Whether you’re a telecom operator looking to expand your portfolio, a public institution requiring sovereign infrastructure, or an enterprise tired of vendor lock-in, Quobis has a deployment model that fits.

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Explore Quobis Open Source Based Solutions

  • IP Multimedia Subsystem

  • Communication Platform

  • Open source telecommunications software

  • Quobis Caller Score

  • Quobis WAC

  • click to call

  • Quobis SDK

  • Quobis Softphone

  • Quobis Phone for Microsoft Teams

  • Collaborator

  • Open Source PBX