John A.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Are you dealing with one-way audio, dropped calls, SIP registration failures, billing interruptions, or security attacks? I’m a VoIP Engineer & Cloud PBX Specialist who designs, secures, and automates enterprise-grade phone systems using Asterisk, FreePBX, SIP, WebRTC, and AI voice integrations, deployed on AWS, DigitalOcean, Hetzner, and Google Cloud. I don’t just install PBX systems. 👉 I architect scalable call infrastructures 👉 Harden servers against SIP fraud 👉 Build automated billing & recharge systems 👉 Integrate AI voice bots and real-time audio pipelines 👉 Migrate on-prem VoIP systems to the cloud with zero downtime 🚀 What I Can Do For You 📞 Cloud VoIP Deployment & Migration Full installation of Asterisk, FreePBX, Issabel AWS EC2/VPC & Google Cloud deployments On-prem → cloud migration Multi-tenant PBX systems for resellers & call centers 🔐 VoIP Security & Anti-Fraud Hardening Fail2Ban & IPTables SIP scanner protection (SIPVicious, brute force) AWS Security Groups & firewall rules Call rate limiting & fraud detection 🔁 Advanced Call Routing & IVR Multi-level IVRs Time conditions (day/night routing) Call queues, recording, and monitoring Twilio, Telnyx, Bandwidth SIP trunk integration Least-cost routing 💳 Automated Billing & Recharge Systems Balance monitoring scripts Auto-top-up triggers Payment gateway integration Auto-generated PDF invoices Email delivery to finance teams 🤖 AI Voice & Real-Time Audio LiveKit + Asterisk integration WebRTC calling Speech-to-text pipelines AI voice assistants Call transcription & analytics ⭐ Why Clients Hire Me ✅ 24/7 Monitoring & Emergency Support ✅ Enterprise-Grade Architecture ✅ Zero-Downtime Migrations ✅ Automation-Focused Engineer ✅ Custom Scripting (Python/Bash/Node) ✅ Clear Communication & Fast Response I operate like a systems engineer, not just technical support. 🧰 Tech Stack VoIP: Asterisk, FreePBX, SIP, PJSIP, WebRTC AI Voice: LiveKit, Whisper, GPT APIs Cloud: AWS, DigitalOcean, Hetzner, Vultr DevOps: Docker, Kubernetes, Terraform, CI/CD Automation: Python, Bash, Node Security: Fail2Ban, IPTables, Firewalling Whether you need a quick SIP fix, a cloud PBX rebuild, or a fully automated call center with AI voice and billing, I’m ready to help immediately. KEYWORD PROFICIENCY: Asterisk, FreePBX, FreeSWITCH, Kamailio, OpenSIPS, VICIDIAL, 3CX, PBX, VoIP, VoIP PBX, VoIP Administration, VoIP Software, SIP, Session Initiation Protocol, IVR Software, Telephone Systems, Call Center Management, Call Center Software, Phone Support, Phone Communication, Telecommunications Engineering, Microsoft Teams, RingCentral, Avaya, Skype for Business, Network Engineering, Network Design, Network Planning, Network Monitoring, Network Security, Cloud Computing, Cloud Engineering, AWS CloudFormation, AWS Systems Manager, Microsoft Azure Administration, VMware Administration, Linux System Administration, Windows Server, Web Server, IT Support, System Administration, System Configuration, Virtualization, Cluster Computing, Ceph, Docker, Kubernetes, CI/CD, Terraform, DevOps, Computer Networking, MySQL Programming, JavaScript, TypeScript, PHP, Node.js, Vue.js, React, Web Development, Full-Stack Development, AI Agent Development, AI App Development, Artificial Intelligence, Machine Learning, Deep Learning, LangChain, AI Consulting, AI Model Training, Conversational AI, Natural Language Processing, Predictive Analytics, Automation, Business Process Automation, CRM Automation, Marketing Automation, Automated Workflow, Task Automation, Twilio, Twilio API, Twilio Voice, Twilio IVR, Twilio SIP, Twilio Webhooks, Twilio Studio, Twilio Flex, Twilio Programmable Voice, Twilio Call Routing, Twilio Contact Center, Twilio AI Integration, Twilio Telephony, Twilio SMS Automation, Twilio Outbound Calling, Twilio Inbound Calling, Twilio Voice Bot, Vapi, Vapi AI, Vapi Voice Agent, Vapi Voice Bot, Vapi API Integration, Vapi Telephony, Vapi Conversational AI, Vapi Outbound Calls, Vapi Inbound Calls, Vapi Automation, Vapi Workflow Integration, Retell, Retell AI, Retell Voice Agent, Retell Voice Bot, Retell API Integration, Retell Call Automation, Retell Telephony, Retell Conversational AI, Retell IVR, Retell Automation, Retell Workflow, Retell Outbound Calls, Retell Inbound Calls, Call Routing, Appointment Scheduling, Lead Generation, CRM Systems, HubSpot, GoHighLevel, Clear Communicator, Accountable for Outcomes