fOCS

fOCS – FOSS Online Charging System: OCS/AAA/PCRF

fOCS (aka FOSS Online Charging System) is yREMORA’s real-time billing and charging solution for telecommunications networks, combining OCS, AAA, and PCRF functions into a single Erlang/OTP application. Built on the robust open-source SigScale OCS framework and distributed under the permissive Apache License 2.0, fOCS delivers carrier-class online charging with the flexibility of contemporary deployment architectures.

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Key Capabilities

Flexible Deployment Models

Deploy fOCS in containerized environments (Docker, Kubernetes with Helm charts), virtualized infrastructure (VMware, KVM, OpenStack), or directly on bare-metal servers. RPM packaging available for RHEL, Rocky, Fedora, and RedOS. Choose the architecture that fits your operational requirements.

Real-Time Online Charging

Full Online Charging System (OCS) performing real-time authorization and charging across voice, data, and SMS services:

• Session Charging with Unit Reservation (SCUR) for ongoing sessions
• Event Charging with Unit Reservation (ECUR) for one-time events (SMS, MMS)
• Prepaid balance management with per-session reservations
• Centralized and decentralized unit determination
• Configurable overflow charging with negative balance support

AAA Server

Integrated Authentication, Authorization, and Accounting over DIAMETER and RADIUS protocols:

• DIAMETER interfaces: Ro/Gy/Wo (charging), Gx (policy), S6a, SWm/STa, SWx, S6b (authentication)
• RADIUS authentication (port 1812) and accounting (port 1813) for WiFi/broadband
• EAP methods: AKA, AKA’, PWD, TTLS — supporting USIM, password, and TLS-based authentication
• HSS proxy functionality for subscriber data lookup

Policy Control (PCRF)

Policy and Charging Rules Function via DIAMETER Gx interface, providing QoS profile enforcement, data rate gating, and flow-based charging control using configurable policy and tariff tables.

5G Core Ready

Native Nrf_Rating REST API (3GPP TS 32.290/32.291) for 5G Core network charging via Service Based Interface (SBI). Supports direct integration with 5GC network functions (AMF, SMF) without protocol translation.

TM Forum Open APIs

Industry-standard REST APIs for OSS/BSS integration:

• TMF620 Product Catalog Management — offer and price management
• TMF637 Product Inventory — subscription lifecycle
• TMF654 Prepay Balance Management — balance and bucket operations
• TMF638 Service Inventory — subscriber identity management
• TMF639 Resource Inventory — tariff table instances
• TMF635 Usage Management — CDR and usage records
• TMF632 Party Management — user administration
• TMF630 Event Hub — real-time webhook notifications

Flexible Rating Engine

Sophisticated pricing and tariff engine supporting multiple charging models:

• Usage-based, one-time, and recurring charges
• Destination-based tariff tables with Global Title Translation (GTT)
• Roaming tariff tables with VPLMN-based rate selection
• Allowance buckets with automatic provisioning on subscription
• Bundle offers combining voice, data, and SMS products

Web Administration GUI

Material design web interface built with Polymer 3 Web Components for complete system management: product catalog, subscriber provisioning, balance operations, tariff configuration, and a real-time dashboard with DIAMETER transaction graphs and connected peer monitoring.

RESTful API Management

Comprehensive API for configuration, provisioning, monitoring, and management — enabling automation, integration with CRM/BSS systems, and programmatic control. Supports TMF Advanced Attribute Filtering, pagination, ETag-based concurrency, and RFC 9457 problem details for error reporting.

High Availability

Built on Erlang/OTP’s fault-tolerant architecture with Mnesia distributed database replication across cluster nodes. Supports hot code upgrade for zero-downtime deployments, supervision trees for self-healing on failure, and lightweight processes enabling millions of concurrent charging sessions.

Open-Source Foundation

Leveraging the proven SigScale OCS (github.com/sigscale/ocs) framework ensures transparency, community-driven innovation, and freedom from vendor lock-in while maintaining enterprise-grade reliability. Distributed under the Apache License 2.0 allowing commercial use and modification.

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Ideal For

Perfect for mobile operators, MVNOs, ISP/WiFi providers, VoIP operators, IoT platforms, and enterprises requiring a real-time billing system for 2G/3G/4G/5G networks with standard interfaces, prepaid balance management, and no vendor lock-in.

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Commercial Competition Analysis