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    2020-01 — 2026-12highload-infrastructure

    Enterprise VoIP Platform

    TelecommunicationsVoIPFusionPBXFreeSWITCHCRMAIDevOps

    📞 Project: Enterprise VoIP Platform (2020–2026)

    Complete Technical Portfolio

    • Industry: Telecommunications / VoIP
    • Type: Full-stack VoIP platform development
    • Status: Production (10+ servers, active)

    📌 Project Scope

    Complete VoIP platform based on FusionPBX / FreeSWITCH with deep customizations, performance optimization, and custom product modules.

    Scale

    • 10+ production servers (HA clusters)
    • 10,000+ concurrent daily calls
    • 350+ feature implementations and modifications
    • 15+ third-party integrations
    • 99.9%+ uptime over 5 years
    • Billions of CDR records

    Work Performed

    • Extended/modified core FusionPBX modules
    • Custom FreeSWITCH dialplan and Lua logic
    • Full CRM platform built from scratch
    • AI call analysis pipeline
    • SMS/MMS platform with package management
    • Mobile applications (iOS/Android) + Chrome extension
    • REST API ecosystem
    • Multi-carrier integration and analytics
    • Infrastructure and operations management

    🧩 FusionPBX Platform Development

    Core Modules (Modified / Extended / Upgraded)

    • Extensions: softphone-only mode, ACL automation, bulk operations, range management, MAC and caller ID controls, extension types, paid/non-paid classification
    • Dialplan: multi-carrier failover, least-cost and geographic routing, time-based routing, E911 handling, outbound optimization
    • IVR Menu: database-driven dynamic menus, Lua integration, live testing, call flow visibility, timeout customization
    • Ring Groups / Call Flows / Conference / Recordings: advanced routing controls, recording policies, performance improvements, dependency tracking
    • Time Conditions: calendar integration, what-if simulator, holiday logic, debugging tools
    • Call Center: real-time dashboard, queue metrics, callback management, supervisor controls
    • Voicemail: greeting management, transcription integration, retention policies, MWI optimization
    • Destinations / Call Routing: DID lifecycle, domain assignment, carrier sync, batch operations, usage tracking
    • CDR: AI analysis integration, advanced filtering, role-based visibility, partitioning and archiving automation
    • User / Permissions / Menu Manager: extended RBAC, audit logging, policy controls, bulk permission workflows
    • Contacts: full rewrite with groups, import/export validation, Yealink XML export, CRM integration
    • Email Queue / Fax / Follow Me / MOH / Notes / Event Guard: reliability improvements, status tracking, security and observability enhancements

    Custom Modules

    • Ringotel Integration: organization/account provisioning, QR onboarding, sync, call park, DND, role model, contribution to official FusionPBX apps
    • SMS Packages: monthly limits, billing cycles, MMS point system, logs, webhook STOP/START handling
    • Bandwidth DID Management: inventory sync, ordering status, notes and lifecycle tracking
    • IPA (Integration/API): JWT auth, rate limits, IP whitelist, endpoint ecosystem, request logging, docs
    • Analytics Integration: multi-carrier export and billing analytics
    • In Use Detection System: dependency graph across modules with visual and popup references
    • Label Printing Integration: Label.live integration with templates and automated triggers

    ⚙️ FreeSWITCH Development

    Core Functionality (Managed / Optimized)

    • Multi-tenant SIP registration and endpoint authentication
    • NAT traversal, SIP-TLS, codec negotiation (Opus, G.711, G.722)
    • Multi-context dialplan and emergency routing
    • RTP/SRTP media flows, transcoding, conference bridges, call recording
    • Parking, transfer, pickup, voicemail, ACD queues

    Custom Development

    • Lua scripts (100+): dynamic IVR, time/geographic routing, queue and overflow logic, business hour and holiday calculations
    • ESL daemon (Perl): real-time events, CRM screen-pop (<300ms), WebSocket bridge, AI trigger hooks
    • Dialplan customization: carrier failover, least-cost routing, recording/transfer/voicemail strategies
    • Performance tuning: RTP range, session limits, codec priorities, memory and FD limits, DB pooling

    🏗 Custom Applications

    1. CRM Portal (Angular + Yii)
      Contact operations, scripts, queue distribution, click-to-dial WebRTC, real-time dashboards, HubSpot/Zoho/FusionPBX integration.

    2. AI Call Analysis Pipeline
      STT + LLM summarization, sentiment, quality score, action items; automatic post-call processing.

    3. SMS/MMS Platform
      Package limits, scheduling, templates, compliance (STOP/START), high-volume batching.

    4. DID Hub
      Multi-carrier number lifecycle, pattern search (20+ premium patterns), sync and workflow automation.

    5. Analytics Engine
      Multi-source CDR normalization, billing reports, top metrics, dashboards, CSV/Excel export.

    6. REST API Platform
      Endpoints for tokens, extensions, destinations, CDR, domain state, SMS; multi-tenant scope and audit trail.

    7. Mobile Apps + Extension
      iOS (Swift), Android (Kotlin), and Chrome click-to-dial extension with real-time telephony features.

    🔌 Third-Party Integrations

    • Ringotel
    • Bandwidth (voice/SMS/MMS/number lifecycle)
    • Vitelity (voice/fax/DID)
    • HubSpot
    • Zoho CRM (marketplace app)
    • S3 storage (Wasabi/AWS)
    • SMTP providers
    • Zabbix monitoring

    🛡 Infrastructure & Operations

    Production Infrastructure

    • 10+ production servers
    • Active-active HA clusters
    • Multi-datacenter deployment
    • PostgreSQL streaming replication (<1s lag)
    • Automatic failover (<30s)

    Data & Reliability

    • PostgreSQL partitioning for CDR (monthly)
    • Materialized views and optimized indexing
    • Redis for caching/pub-sub/rate limits
    • Daily dumps + WAL archiving + S3 offsite backups
    • Disaster recovery: RTO < 15 min, RPO < 5 min

    Security & Monitoring

    • Fail2Ban custom jails
    • Firewall/IP whitelist control interfaces
    • Automated SSL/TLS (Let’s Encrypt)
    • File integrity monitoring and alerts
    • VoIP-specific Zabbix metrics and escalation policies

    📈 Production Metrics

    • Uptime: 99.9%+ over 5 years
    • Data loss: 0 critical incidents
    • Daily concurrency: 10,000+ calls
    • CDR volume: billions of records (partitioned)
    • Replication lag: <1s average
    • API response: <100ms (p95)
    • Screen-pop latency: <300ms
    • Failover time: <30s
    • SMS throughput: 100k+ messages/day

    🧪 Base Technology Stack

    • VoIP: FreeSWITCH 1.10.x, FusionPBX 5.x, SIP/SIP-TLS, WebRTC
    • Backend: PHP 8.x, Lua 5.1, Perl 5.x, Python 3.9+, Kotlin
    • Frontend: Angular 14+, TypeScript, RxJS, Bootstrap 5, Chart.js
    • Mobile: Swift (iOS), Kotlin (Android)
    • Databases: PostgreSQL 14+, Redis 6.x, MySQL 8.0
    • Infra: Ubuntu 22.04/24.04, Nginx 1.18+, Zabbix 6.x, Fail2Ban
    • Cloud: Wasabi S3, AWS S3
    • AI/ML: Whisper, Ollama, custom Kotlin STT

    ✅ Deliverables Summary

    • 30+ FusionPBX modules modified/extended
    • 10+ custom FusionPBX modules developed
    • 100+ FreeSWITCH Lua scripts
    • 15+ third-party integrations
    • CRM Portal, AI Pipeline, SMS Platform, DID Hub, Analytics Engine, REST API, Mobile Apps, Chrome Extension
    • 10+ production servers with hardened HA and monitoring