PortaOne, Inc.

Sangoma is the primary steward and commercial backing organization behind Asterisk and FreePBX, offering both the open-source FreePBX software platform and commercial PBXact systems for self-hosted and on-premises business telephony.

3CX offers a widely adopted software-based IP PBX platform deployable directly on customer-owned on-premises servers, virtual machines, or self-hosted private cloud environments.

Bicom Systems specializes in turnkey PBX software with dedicated multi-tenant capabilities (PBXware Multi-Tenant Edition) designed specifically for enterprise and service provider multi-tenant voice deployments.

Yeastar provides the P-Series Software Edition, a robust software-based IP PBX designed for private virtual machines or bare-metal enterprise servers supporting unified communications and multi-branch management.

Vodia Networks develops a versatile software IP PBX engineered with native multi-tenancy from the core, making it well suited for self-hosted multi-tenant setups and on-premise business phone system requirements.

Wildix offers a browser- and WebRTC-centric unified communications and IP PBX system capable of deployment in customer private clouds and on-premises virtual environments with multi-location network management.

Mitel offers MiVoice Business, an established enterprise software communication platform that can be deployed on private virtualized infrastructure or on-premises servers across multi-site environments.

Avaya provides the IP Office platform, enabling businesses to host feature-rich unified communications software on private servers, virtual machines, or appliances across distributed enterprise sites.

Sipwise develops the C5 platform, a multi-tenant softswitch and IP PBX software stack suited for service providers and large enterprises wanting self-managed or on-premises Class 5 VoIP telephony infrastructure.

Purpose-built for MSPs and UCaaS resellers, providing automated CDR mediation, rating, and white-label invoicing with native integrations into MSP PSAs (ConnectWise, Datto Autotask, HaloPSA) and automated telecom tax engines (Avalara, CCH SureTax, Compliance Solutions) across the US, UK, Australia, and New Zealand.

Offers an enterprise-grade communications billing, PSA, and payments platform tailored for MSPs, telecom resellers, and IoT providers requiring high-volume CDR rating, complex bundling, and integrated telecom tax automation.

Provides a multi-tenant, white-label revenue management and convergent billing engine designed for MSPs, telecom operators, and MVNOs, supporting complex CDR rating, multi-tier reseller channels, and dynamic taxation integration.

Delivers real-time usage mediation and agile subscription billing for telecommunications, UCaaS, and MSP providers handling variable usage rating, international currency management, and integrated compliance taxation.

Specializes in B2B subscription and multi-source usage-based billing orchestration for MSPs and cloud communication resellers, offering complex mediation, margin analysis, and integration with telecom tax systems.

Provides an all-in-one cloud OSS/BSS and telecom billing platform built for service providers and MSPs selling VoIP, IoT, and wireless, featuring native CDR rating, integrated CRM, and automated telecom tax engine connections.

Focuses on regulatory compliance, CDR mediation, and converged billing for MSPs, CLECs, and voice resellers, offering deep integration with next-generation tax engines like CereTax to optimize regulatory fees and tax filings.

Delivers a wholesale voice and quote-to-cash platform tailored for MSPs, featuring an integrated billing and taxation engine that rates usage and automates compliant invoices without requiring external third-party billing layers.

Provides a white-label UCaaS and VoIP enablement platform for MSPs that incorporates a built-in quote-to-cash billing engine, carrier CDR mediation, and Avalara-backed automated telecom tax calculations.