---
title: "About System & Platform Architecture Module Documentation"
description: "Documentation for About System"
---

> **Module Code:** `billing/client/about`  
> **Trigger:** User Menu -> About  
> **Dialog Component:** `AboutModal.tsx`  
> **Brand Purity:** 100% White-Label Compliant (Ring2All Billing)

---

## Table of Contents
1. [Executive Summary & Platform Identity](#1-executive-summary--platform-identity)
2. [Technical Architecture & Component Breakdown](#2-technical-architecture--component-breakdown)
3. [🎯 User Roles & Key Capabilities](#3--user-roles--key-capabilities)
4. [Visual Interface & Screen Breakdown](#4-visual-interface--screen-breakdown)
5. [Core Engine Components & Specifications](#5-core-engine-components--specifications)
6. [Security Governance & Tokenization Standards](#6-security-governance--tokenization-standards)
7. [System Diagnostics & Verification](#7-system-diagnostics--verification)
8. [Domain Glossary](#8-domain-glossary)

---

## 1. Executive Summary & Platform Identity

The **About System** module provides operators, system integrators, and enterprise subscribers with an instant overview of the underlying BSS architecture powering the Ring2All Billing Customer Portal.

```
+-------------------------------------------------------------------------------+
|                       COMMERCIAL & OPERATIONAL IMPACT                         |
+-------------------------------------------------------------------------------+
| • Transparent Technical Pedigree: Clearly displays platform software versions|
|   and production engine specifications to technical auditors.                 |
| • Enterprise Assurance: Highlights carrier-grade PostgreSQL 17 clustering,    |
|   Fastify 5 asynchronous performance, and sub-millisecond OCS latency.        |
| • PCI-DSS Certified Standards: Documents Stripe vaulted tokenization.         |
| • Unified Brand Identity: Clean, white-label presentation under the           |
|   Ring2All Billing ecosystem.                                                 |
+-------------------------------------------------------------------------------+
```

---

## 2. Technical Architecture & Component Breakdown

The Customer Portal operates as a lightweight, secure satellite application interfacing with the carrier softswitch core:

```
 ┌────────────────────────────────────────────────────────────────────────┐
 │            Ring2All Billing Customer Portal (Client Edition v1.0.0)    │
 │            React 18 / Vite / Tailwind CSS / Zustand Store              │
 └───────────────────────────────────┬────────────────────────────────────┘
                                     │
           ┌─────────────────────────┼─────────────────────────┐
           │                         │                         │
           ▼                         ▼                         ▼
 ┌───────────────────┐     ┌───────────────────┐     ┌───────────────────┐
 │  Backend Engine   │     │ High-Perf Storage │     │  Real-Time OCS    │
 │  Fastify 5        │     │ PostgreSQL 17     │     │  Sub-millisecond  │
 │  Node.js 22 LTS   │     │ Kysely Query Bldr │     │  Pre-Auth Engine  │
 └───────────────────┘     └───────────────────┘     └───────────────────┘
```

---

## 3. 🎯 User Roles & Key Capabilities

Access to system specification diagnostics is available to all authenticated portal users:

| User Role | Access Level | Primary Operational Capabilities |
| :--- | :--- | :--- |
| **All Portal Subscribers** | Specification Inspection | Verifies active software version, technical capabilities, and compliance standards. |
| **Technical Support Engineers** | Diagnostic Baseline | Confirms software release baseline during troubleshooting sessions. |
| **Enterprise Security Auditors** | Compliance Review | Verifies that storage, rating, and PCI tokenization adhere to corporate standards. |

---

## 4. Visual Interface & Screen Breakdown

### 4.1 About System & Specifications Modal
The modal opens smoothly from the user avatar dropdown menu:

![About System Architecture & Engine Modal](/screenshots/billing/client/about/about-modal.png)

* **Header Branding:** Displays the unified Ring2All Billing icon, application title (`Ring2All Billing Customer Portal`), and subtitle (`Carrier Telecom BSS & Self-Care Subsystem`).
* **Software Version:** Outlines active production release `v1.0.0 (Client Edition)`.
* **Architecture Grid:** Quad-card breakdown covering Backend Engine, Storage, Real-Time OCS, and PCI-DSS Security.
* **Overview Summary:** Executive description of automated minute refills, CDR queries, and trunk management.

---

## 5. Core Engine Components & Specifications

### 1. Backend Engine
* **Technology:** Fastify 5 running on Node.js 22 LTS.
* **Capabilities:** Highly concurrent non-blocking I/O capable of handling over 25,000 JSON requests per second per node.

### 2. High-Performance Storage
* **Technology:** PostgreSQL 17 with Kysely Type-Safe Query Builder.
* **Capabilities:** Partitioned CDR tables, multi-tenant row-level indexing, and sub-second analytical reporting.

### 3. Real-Time OCS (Online Charging System)
* **Technology:** In-memory Kamailio `htable` + Redis balance cache.
* **Capabilities:** Sub-millisecond pre-call authorization and mid-call credit floor enforcement.

### 4. PCI-DSS Security
* **Technology:** Stripe Tokenization & Vaulted Payment Methods.
* **Capabilities:** SAQ-A compliance ensuring zero cardholder data touches application disks or network buffers.

---

## 6. Security Governance & Tokenization Standards

* **Zero Plaintext Storage:** Passwords hashed with Argon2id cryptographic salt.
* **Secure JWT Lifecycles:** Asymmetrically signed JSON Web Tokens with short expiry windows and automatic sliding refresh.
* **Perimeter Hardening:** Protection against automated brute force and Layer 7 flooding via Fail2Ban and AI Perimeter Guard.

---

## 7. System Diagnostics & Verification

### Verify Running Backend Process
```bash
# Execute on Billing Server
systemctl status ring2all-billing-api.service
curl -s http://127.0.0.1:3000/health
```

---

## 8. Domain Glossary

* **BSS (Business Support Systems):** Telecom software managing billing, customer subscriptions, and rating.
* **Fastify:** High-performance web framework for Node.js focused on minimal overhead.
* **Argon2id:** Winner of the Password Hashing Competition (PHC) providing maximum resistance against GPU/ASIC cracking.