You will get AI Outbound Or Inbound Calling or IVR Agent Setup
Project details
Looking to automate phone calls with a lifelike voice assistant? I will build and white-label a custom AI voice agent powered by GPT-4, Whisper (STT), and Amazon Polly or ElevenLabs (TTS).
✔️ Fully branded dashboard
✔️ Twilio call handling
✔️ Whisper or Deepgram transcription
✔️ GPT-4 response generation
✔️ Polly/Coqui/ElevenLabs voice synthesis
✔️ GoHighLevel (GHL) CRM sync
✔️ n8n automation (open-source Zapier)
Perfect for real estate, med spas, law firms, e-commerce, or agencies.
Generate leads, book appointments, or answer FAQs — automatically — with a human-sounding AI phone agent, branded as your own.
Let’s take your business voice-first. 🚀
✔️ Fully branded dashboard
✔️ Twilio call handling
✔️ Whisper or Deepgram transcription
✔️ GPT-4 response generation
✔️ Polly/Coqui/ElevenLabs voice synthesis
✔️ GoHighLevel (GHL) CRM sync
✔️ n8n automation (open-source Zapier)
Perfect for real estate, med spas, law firms, e-commerce, or agencies.
Generate leads, book appointments, or answer FAQs — automatically — with a human-sounding AI phone agent, branded as your own.
Let’s take your business voice-first. 🚀
Purpose
BusinessIndustry
Business Services & Consulting, Construction, Data Analytics, Ecommerce, Education, Events Planning, Fashion & Apparel, Financial Services, Food & Beverage, Government & Public Sector, Hardware & Electronics, Lifestyle, Logistics & Supply Chain Management, Manufacturing & Storage, Marketing & Advertising, Media & Entertainment, Medical & Pharmaceutical, Nonprofit, Real Estate, Religion & Spirituality, Retail & Wholesale, Software, Sports & Fitness, Telecommunications, Transportation & Automotive, Travel & Tourism, WellnessLanguage
EnglishWhat's included $799
These options are included with the project scope.
$799
- Delivery Time 10 days
Optional add-ons
You can add these on the next page.
Fast 7 Days Delivery
+$1,000
65 reviews
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GF
Giorgio F.
May 24, 2026
Linux/VoIP Sysadmin Hetzner CX42 + PJSIP 2.14.1 + Twilio SIP Trunk Experts only Fixed$180
Pankaj delivered solid, production-grade work on the voice AI pipeline integration (VoIP, RTP, Whisper STT, Anthropic LLM, Inworld TTS). The stabilization phase brought real improvements: clean async architecture, working barge-in handling, multilingual fallback logic, and tested deployment on Hetzner. Documentation was thorough and the codebase was left in a maintainable state.
Communication was professional and reliable throughout the engagement. He raised technical concerns proactively and explained trade-offs clearly.
I recommend Pankaj for VoIP, real-time audio, and AI voice pipeline projects.
Giorgio
Communication was professional and reliable throughout the engagement. He raised technical concerns proactively and explained trade-offs clearly.
I recommend Pankaj for VoIP, real-time audio, and AI voice pipeline projects.
Giorgio
GF
Giorgio F.
Apr 26, 2026
Linux/VoIP Sysadmin Hetzner CX42 + PJSIP 2.14.1 + Twilio SIP Trunk Experts only Fixed$180
"Pankaj delivered Block 1 professionally and on time. He solved technical problems independently, switched from PJSIP to Asterisk autonomously when needed, and communicated clearly throughout. Clean documentation and reliable work. Highly recommended."
SF
Steven F.
Apr 23, 2026
CDL Development Backend
Pankaj was highly responsive and quickly grasped the requirements for a complex digital forensics task. He delivered a thorough forensic report in multiple formats, proactively supplemented his work with additional analysis, and offered helpful guidance on tooling. Communication was prompt and professional throughout. Recommended for backend/forensics and data-parsing engagements
EZ
Enrique J. Z.
Jan 12, 2025
call center twilio
Pankaj responds very fast and is expert in call centers. he solved our issues very fast.
SV
Sidney V.
Sep 6, 2021
Database Development, Schema and Documentation, API development & Swagger Documentation
Great experience with gVenture. Smart and hard working. Will work with them more in the future.
About Pankaj
FreeSWITCH | Asterisk | AI Automation & Voice Agent Architect | CCaaS
100%
Job Success
Delhi, India - 10:10 am local time
I help telecom providers, startups, BPOs, answering services, and service businesses build production-ready communication platforms, AI voice systems, and workflow automations that reduce manual work, improve customer handling, and scale reliably.
My core work spans FreeSWITCH, Asterisk, FusionPBX, SIP, WebRTC, Contact Center platforms, multi-tenant PBX, AI Voice Agents, and business process automation. Whether you need a hosted PBX, a custom CCaaS platform, AI-powered call handling, or workflow automation across CRM, support, and operations, I can design, build, integrate, and scale the complete solution.
Contact Center (CCaaS), PBX & VoIP Platform Development
I build complete telecom and customer communication platforms for telecom providers, contact centers, answering services, and enterprise teams.
Services include:
• Custom Contact Center (CCaaS) platforms
• Hosted PBX, UCaaS, and Multi-Tenant PBX systems
• Agent dashboards, supervisor panels, wallboards, and reporting
• Skill-based routing, IVR, call flow automation, and queue management
• Predictive, progressive, and power dialers
• Call recording, monitoring, whisper, barge, and analytics
• CRM integrations, click-to-call, callback workflows, and usage reporting
• DID provisioning, SIP trunk integrations, and carrier connectivity
• White-label telecom platforms for providers and resellers
FreeSWITCH, Asterisk & FusionPBX Development
Telephony is my core specialization—not just PBX setup, but full product and platform development.
I work on:
• FreeSWITCH ESL development, custom dialplans, and call routing logic
• Asterisk AGI, AMI, and ARI integrations
• FusionPBX and FreePBX customization
• VICIdial and outbound campaign platform customization
• Multi-tenant PBX architecture and provisioning flows
• SIP trunking, DID routing, RTP troubleshooting, and WebRTC softphones
• Performance optimization, high-availability design, and production deployment
AI Voice Agents, AI Integration & Workflow Automation
I help businesses use AI where it creates measurable operational value—not just demos or isolated bots.
I design and implement:
• AI Voice Agents, AI receptionists, AI IVR, and intelligent call routing
• OpenAI, Claude, Gemini, and real-time voice integrations
• Voice AI workflows for customer service, after-hours call handling, lead qualification, and phone automation
• CRM automation, email automation, reporting workflows, and internal process automation
• AI assistants for support teams, operations teams, and internal knowledge workflows
• API-based workflow automation across multiple systems and business tools
Tools and platforms I work with include OpenAI, Claude, Gemini, LiveKit, ElevenLabs, Deepgram, REST APIs, webhooks, and custom backend integrations. Where needed, I can also help evaluate the right automation stack and connect AI capabilities into your existing business systems.
Technology Stack
Telephony: FreeSWITCH, Asterisk, FusionPBX, FreePBX, VICIdial, SIP, RTP, WebRTC, SIP.js, Twilio, Telnyx, LiveKit
Backend: Node.js, NestJS, Python (FastAPI), Laravel, PostgreSQL, MongoDB, Redis, REST APIs, WebSockets
Infrastructure: Linux, Docker, Kubernetes, Nginx, AWS, Azure, GCP, Prometheus, Grafana, CI/CD
Recent Project Types
• Multi-tenant CCaaS platforms with real-time dashboards and analytics
• AI Voice Agents integrated with FreeSWITCH using OpenAI Realtime API
• FusionPBX deployments and customizations for hosted PBX providers
• VICIdial implementations with CRM integration and outbound campaign workflows
• Telecom ERP systems with CDR billing, DID provisioning, and reseller management
• Answering service platforms with AI-assisted routing and live-agent fallback
• Custom workflow automation and AI integration for communication-heavy operations
Why Clients Hire Me
✔ 20+ years building telecom, VoIP, and communication software
✔ 90+ successful Upwork contracts
✔ Deep expertise in FreeSWITCH, Asterisk, FusionPBX, SIP, and Contact Center systems
✔ Ability to combine telecom engineering, backend development, and AI automation in one solution
✔ Production-ready architecture with realistic scoping and long-term support
✔ Clear communication, practical implementation, and business-focused problem solving
If you need a consultant or hands-on developer for FreeSWITCH, Asterisk, FusionPBX, Contact Center platforms, AI Voice Agents, VoIP systems, or AI workflow automation, I can help you build a reliable solution that supports real business operations—not just prototypes.
Steps for completing your project
After purchasing the project, send requirements so Pankaj can start the project.
Delivery time starts when Pankaj receives requirements from you.
Pankaj works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements Gathering
Define use case, business goals, and user flows Confirm number of call intents or flows Gather CRM details (e.g. GoHighLevel API access) Select preferred STT (Whisper/Deepgram) TTS (Polly/ElevenLabs), and hosting approach
Account & API Setup
Get access to Twilio, OpenAI, GoHighLevel, n8n, and optionally AWS or ElevenLabs Share client branding assets (logo, color codes, greeting lines)