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We are looking for an experienced backend / VoIP developer to build an AI-based call system with a fully integrated admin/management dashboard. This project is not only about making AI calls, but about delivering a practical operational system that can control, bill, and immediately stop AI calls based on prepaid usage. The AI call engine and the admin dashboard must be delivered as one integrated system. Admin functionality is included in the core scope and is NOT a separate project. Scope of Work (Included) 1. AI Call Core - SIP-based outbound call handling (credentials provided) - RTP audio capture - G.711 μ-law / A-law - Mono, 8kHz - RTP → linear PCM conversion - Real-time AI voice integration Bi-directional audio flow is required: - Call audio → AI (STT / processing) - AI voice response (TTS) → back into the live call - Basic AI-driven call flow(Call start → AI greeting → response loop → call end) 2. Stability & Session Handling - Per-call session isolation - Non-blocking audio streaming - Timeout and error handling for AI API - Graceful call termination on failure - Stable handling of multiple concurrent calls (basic level) 3. Integrated Admin Dashboard (Required) The admin dashboard is a mandatory part of this project and must be fully integrated with the call engine, not a standalone or mock interface. Account Structure - HQ / Distributor / Client roles - Basic account creation, activation, and deactivation Prepaid Billing & Control - Prepaid balance per client - Manual credit top-up (admin action) - Real-time usage deduction handled automatically by the system - Billing rate: KRW 13.72 per 10 seconds (KRW only) - When balance reaches zero: Ongoing calls stop immediately, New calls are blocked Monitoring -Balance view -Basic usage summary -Call history (time, duration, deducted amount) No payment gateway integration is required. No USD conversion or exchange-rate logic is required. Explicitly Out of Scope - Postpaid billing - Negative balances - Payment gateway integration - Advanced analytics or dashboards - UI/UX polishing beyond functional level - AI model training or fine-tuning Definition of Done (Important) The project is considered complete only when all conditions below are met: - At least one real outbound call completes successfully with live bi-directional AI interaction - Audio flows bi-directionally between the call and the AI - The admin dashboard is fully integrated with the call engine - Usage is deducted in real time by the system - Calls stop immediately when the prepaid balance reaches zero - All critical bugs are fixed and the system runs stably under normal usage - Final verification and acceptance by the client Contract & Payment Structure - Base Payment: USD $1,200 (implementation) - Success Bonus: USD $800 (Paid only after full completion, stabilization, and final acceptance) - Total Possible Payment: USD $2,000 - Fixed-price, milestone-based contract - No additional charges within the agreed scope Ideal Candidate - Strong experience with Asterisk / SIP / RTP - Comfortable with real-time audio processing - Experience integrating AI voice APIs (STT / TTS) - Able to deliver end-to-end working systems, not partial demos - Clear communication and responsibility for completion When Applying, Please Include - Your experience with SIP / RTP / VoIP systems - Whether you work individually or as a team - A brief description of a similar project you have completed Please apply only if you are comfortable with the base + success bonus structure and delivering the full scope described above.
Projekt-ID: 40065854
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Hi gyeongcompany, Last week i successfully completed a similar project (not exactly same but similar) I understand your goal: a production-ready AI dialer with an integrated admin that enforces prepaid control in real time—calls must cut the instant KRW balance hits zero, not a demo. Experience: 10+ yrs SIP/RTP/Asterisk. Built an AI outbound agent with bi‑directional streaming (G.711→PCM), Deepgram STT + TTS back into live calls, and prepaid rating with instant hangup. I work individually. Low-risk workflow: - Core: Asterisk/PJSIP for SIP; ARI/AMI call control; jitter buffer; G.711 μ/A decode to 8k mono PCM. - Streaming: non‑blocking WS to STT; TTS returned to RTP via media hook; per‑call session isolation. - Billing: atomic per‑second metering rated at KRW 13.72/10s, continuous deduction, instant hangup and call blocking at zero. - Dashboard: single integrated service with HQ/Distributor/Client roles, manual top‑ups, live balances, usage summary, call history. - Stability: timeouts, AI fallback, graceful termination; basic concurrent calls + load tests. Suggestion: - Implement a balance “token bucket” per call to guarantee sub‑second cutoffs and avoid race conditions under concurrency Best Regards, Sid [login to view URL] https://www.freelancer.in/u/Ekarthaan
$1.500 USD in 11 Tagen
0,0
0,0
69 Freelancer bieten im Durchschnitt $1.174 USD für diesen Auftrag

With over 10 years of experience in web and mobile development, including expertise in backend and VoIP systems, I understand the challenges you face in developing an AI-based call system with an integrated admin dashboard. In the past, I have successfully delivered projects in the fintech and healthcare sectors, showcasing my ability to build practical operational systems that meet specific requirements. One notable project involved implementing AI-driven features for enhanced user experiences in a similar domain. I am confident that my experience with SIP, RTP, and VoIP systems, along with my track record of delivering end-to-end solutions, makes me an ideal candidate for your project. I work individually and can assure you of clear communication and responsibility for completion. If you are looking for a developer who can meet your needs and deliver the full scope of the project within the agreed budget and timeline, I am here to help. Let's discuss how we can bring your AI-based VoIP call system to life.
$1.200 USD in 20 Tagen
6,8
6,8

I HAVE BUILT FULLY FUNCTIONAL AI-DRIVEN VOIP SYSTEMS WITH REAL-TIME AUDIO AND ADMIN CONTROL – READY TO DELIVER YOUR END-TO-END SOLUTION. I can develop your AI-based call system with fully integrated admin dashboard, handling SIP/RTP audio, real-time AI STT/TTS, and prepaid usage management exactly as outlined. Core Features AI Call Engine: SIP-based outbound calls, RTP → PCM conversion, mono 8kHz, bi-directional audio flow with AI processing Session & Stability: Per-call isolation, non-blocking streaming, timeout/error handling, graceful call termination Admin Dashboard: Role-based accounts (HQ / Distributor / Client) Prepaid balance tracking & real-time deduction ll monitoring, usage summary, call history Auto-stop on zero balance, block new calls Billing: KRW 13.72 per 10 seconds, manual top-up via admin User Roles HQ / Distributor / Client: Access based on role; balance management; monitoring Admin: Full control over accounts, usage, and call supervision I will provide full source code and ensure the sysem is self-contained, stable, and ready for immediate use. I offer 2 years of free ongoing support post-launch for any issues or adjustments related to the system. I have hands-on experience with Asterisk, SIP, RTP, and AI voice API integration, and I can deliver an operational system matching your exact specifications and milestone structure.
$1.000 USD in 15 Tagen
6,4
6,4

Dear Client, I am excited about your project "AI-Based VoIP Call System Development" and confident I can deliver excellent results. With strong experience in similar work, I understand your requirements and can start immediately. I would love to discuss your project further and answer any questions. Thanks and best regards, Kamran
$790 USD in 13 Tagen
6,0
6,0

Hi there, Building a VoIP system that integrates real-time AI audio processing with strict prepaid billing is challenging; latency issues or delayed balance checks can instantly drain revenue and ruin the user experience. I am an expert in Asterisk and SIP/RTP protocols, capable of ensuring millisecond-precision call termination when funds run out while maintaining smooth bi-directional audio flow. I will deliver the fully integrated AI engine and Admin Dashboard, ensuring the KRW billing logic and session isolation function exactly as specified. Here are two quick questions regarding the scope: 1. Which specific AI provider are you targeting for the STT/TTS conversion to ensure we meet the real-time latency requirements? 2. Do you have a preferred technology stack for the dashboard, or should I select the most efficient Node.js framework for handling concurrent socket connections? Let’s discuss your project now!
$800 USD in 10 Tagen
4,3
4,3

Yes, we’ve successfully completed the same projects before and are confident we can deliver this one with the highest quality and within your timeline. We specialize in this type of work and would love to discuss your requirements in detail to ensure a smooth and timely delivery.
$1.200 USD in 7 Tagen
5,4
5,4

Hello gyeongcompany, I am Vishal Maharaj, with 20 years of experience in Artificial Intelligence and Node.js. I have carefully reviewed your project requirements for developing an AI-based VoIP call system with an integrated admin dashboard. To accomplish this project, I will utilize my expertise in SIP, RTP, and real-time audio processing to create a stable and efficient system. The AI call engine will handle outbound calls, integrate AI voice APIs for speech-to-text and text-to-speech functionalities, and ensure real-time usage deduction based on prepaid balance. The integrated admin dashboard will provide account management, prepaid billing, and monitoring functionalities as per your specifications. I am confident in my ability to deliver a high-quality solution that meets your needs. Please initiate a chat to discuss the project further. Cheers, Vishal Maharaj
$1.500 USD in 10 Tagen
5,2
5,2

Hi ,I reviewed your project requirements and I’m confident that my technical expertise aligns well with what you’re looking for. I specialize in designing and developing scalable applications with a focus on performance, clean architecture, and long-term maintainability. My Technical Expertise Includes: ?AI & Automation — NLP, predictive analytics, chatbot development, workflow automation ?Python Development — FastAPI / Flask / Django, API development, backend architecture ?MERN Stack — MongoDB, Express, React, Node.js for full-stack web applications ?Mobile Development — React Native & Flutter for high-performance cross-platform apps ?Cloud & Integrations — Firebase, AWS, REST APIs, micro-services architecture I believe in clear communication, timely delivery, and building solutions that are not just functional — but future-ready, scalable, and optimised for real-world use. Whether the requirement is a small module or a full-scale system, I’m confident that I can deliver with precision, quality, and reliability. I would be glad to discuss your technical scope further and collaborate with you to bring your project to life. Looking forward to connecting with you. Best regards, Vinod Kumar
$750 USD in 7 Tagen
4,3
4,3

Hello Greetings Of The Day We are Great fit because we are working in IT industry since 8 Years we have Experienced and quality developers in our Team and We are serving and making our clients happy and satisfied since last 8+ years with our outstanding performance in the fields of Website Development, Mobile App Development (Android, iOS, Desktop), CRM/ERP Development, AI ML, UX/UI Design, Games, Digital Marketing and Blockchain. Working Tech is PHP, Node, JS , Flutter , HTML, React, python, Unity and Many more. We also work over the similar projects posted by you so please open the communication by responding, so that we can provide you all demo details. I hope we get a positive reply from your side and we are eagerly waiting to work with you.
$1.125 USD in 7 Tagen
4,1
4,1

I can deliver the AI outbound calling engine and the integrated admin dashboard as one system, with prepaid KRW billing that deducts in real time and hard-stops calls the moment balance hits zero. How I’d implement it VoIP core: Asterisk (ARI) or FreeSWITCH as the SIP/RTP controller, with a dedicated media service to handle RTP capture, G.711 μ-law/A-law decode to linear PCM mono 8kHz, and bidirectional streaming back into the live call. AI voice loop: real-time STT to processing to TTS, streamed back to the call with non-blocking I/O, per-call isolation, timeouts, and fail-safe hangup. Concurrency: session manager per call, backpressure handling, and graceful termination on AI API failure. Admin dashboard: Node.js + PostgreSQL with HQ/Distributor/Client roles, client activation controls, manual top-ups, rate KRW 13.72 per 10 seconds, call history, and usage summaries. Hard control: a balance watcher that blocks new calls and immediately sends hangup to active sessions when balance reaches zero, no negative balances. Relevant experience I’ve built real-time systems with strict audit trails and billing style controls, plus multi-role admin panels (HustlerGuys CRM, FuelOps360 style flows). For VoIP, I’m comfortable with SIP/RTP concepts, codec handling, and Asterisk-based call control patterns. One key workflow question Do you want deduction to happen strictly per 10-second block in real time, or as continuous seconds but rounded to 10-second increments for charging?
$1.125 USD in 7 Tagen
4,5
4,5

NEVER USE AI FOR BIDDING! You need a full AI-powered call system with real-time SIP/RTP handling, bi-directional audio integration, automated prepaid billing, and a unified admin dashboard. Built and deployed an almost identical solution: real-time SIP VoIP engine with billing control, admin roles, session isolation, STT/TTS AI, and live usage enforcement. Looking forward to discussing more details. VoIP: Asterisk, FreeSWITCH, SIP, RTP, G.711, PCM, STT/TTS AI integration Backend: Node.js, Python, WebSockets, REST APIs, session handling Dashboard: React, Express, RBAC, usage/billing modules Billing: Prepaid credit, real-time deduction logic, session management
$1.124 USD in 3 Tagen
3,7
3,7

With over 9+ years in web and mobile development, my team and I are more than equipped to successfully deliver your AI-based VoIP call system. Our expertise in E-commerce, Content Management Systems, Android and iOS development and more, will seamlessly overlap with the project requirements'. Not only do we understand SIP/RTP/VoIP systems with a high level of familiarity, but we're also skilled at integrating AI voice APIs such as STT/TTS. From our years of experience, we understand that great products aren't just functional; they are stable, silently powerful and easy to use. With this in mind, your project will be handled as per your explicit definition of done - audio flows bi-directionally & usage deducted in real time.I work alongside a solid team of professionals who ensures smooth handling of projects and cross-browser compatibility for wider audience outreach. Understanding the scope of your project, we believe in sticking closely to the agreed upon timeline and dictum of providing glitch-free services without any additional charges. Comfortable with both Node.js functionalities' customizations and creating fully functional systems from scratch influentially adds more value to our candidature for this project. Stay assured! We have it all covered for you!
$1.125 USD in 7 Tagen
4,4
4,4

Hi, I can deliver an end-to-end AI-driven VoIP calling system with real-time bi-directional audio, prepaid billing controls, and a fully integrated admin dashboard, ensuring stable SIP/RTP handling and strict adherence to your defined scope and acceptance criteria. Can we discuss on chat. Regards Abhishek
$1.125 USD in 7 Tagen
3,6
3,6

I can deliver a fully integrated AI-driven VoIP call system with a real, operational admin dashboard, not a demo or partial setup. My experience covers SIP/RTP call handling, real-time audio processing, and production-grade AI voice integrations where billing, control, and stability are first-class requirements. How I’ll approach this project AI Call Core • SIP-based outbound calling with authenticated credentials • RTP audio capture with G.711 μ-law / A-law handling (mono, 8kHz) • Real-time RTP → PCM conversion • Bi-directional audio streaming between live calls and AI (STT ↔ TTS) • Stable AI-driven call flow (greeting → interaction loop → clean termination) Stability & Concurrency • Per-call isolated sessions • Non-blocking audio pipelines • Robust timeout and AI API failure handling • Graceful termination on errors • Support for multiple concurrent calls at a practical production level Integrated Admin Dashboard (Core Scope) • HQ / Distributor / Client role hierarchy • Account activation/deactivation • Prepaid balance system (KRW-only) • Real-time usage deduction (KRW 13.72 / 10 sec) • Immediate call termination and call blocking when balance hits zero • Call history, balance view, and usage summaries This will be delivered as one cohesive system, with the call engine and dashboard tightly coupled at the logic level not mocked or separated. .
$2.000 USD in 7 Tagen
2,9
2,9

Hello gyeongcompany, I’m an experienced backend & VoIP systems developer with hands-on delivery of production-grade SIP/RTP + AI voice systems, including real-time billing control and admin dashboards. I build complete, stable systems — not demos. I can also show demo code and past call-flow implementations before we finalize. ? How I’ll Deliver Your System 1️⃣ AI Call Core (Real-Time) SIP outbound calling (Asterisk / SIP stack) RTP handling (G.711 μ-law / A-law, mono 8kHz) RTP → PCM conversion (non-blocking streams) Bi-directional AI audio loop: Call → STT → AI logic AI → TTS → live call injection Robust call flow: greeting → dialog loop → clean termination 2️⃣ Stability & Session Control Per-call isolated sessions Async audio pipelines (Node.js / worker threads) Timeout, retry & failure recovery Multi-call concurrency (safe baseline scaling) 3️⃣ Fully Integrated Admin Dashboard (Core Scope) Role hierarchy: HQ → Distributor → Client Prepaid balance logic (KRW only) Real-time usage deduction (KRW 13.72 / 10 sec) Immediate call termination at zero balance Call history, usage summary, balance monitor ? Tech Stack • Asterisk / SIP / RTP • Node.js (real-time services) • AI Voice APIs (STT/TTS) • PostgreSQL / Redis (billing & sessions) ✔ Comfortable with base + success bonus model ✔ Single accountable developer (no hand-offs) ✔ Focused on Definition of Done, not shortcuts Let’s connect — I’ll walk you through similar systems, demo flows, and code.
$1.500 USD in 15 Tagen
3,0
3,0

⭐Surprising Coincidence!!!⭐ I already have done very similar project to this one last month. Let me share my detailed experience via chatting. I'll look forward to hearing from you. Thank you Hunter David
$1.125 USD in 7 Tagen
2,6
2,6

Hello, I built & customized large scale real-time voice and control systems where calls, billing, and dashboards all talk to each other without drama. Looking forward to discuss your project in detail. I work hands-on with SIP, RTP, Asterisk, G.711, and real-time audio pipelines. I’ve integrated live STT/TTS into calls before, handled RTP to PCM conversion, and made sure sessions don’t trip over each other when calls run in parallel. I’m certified in app dev and web dev, and I usually build the call engine and admin dashboard together so billing logic can stop a call mid-sentence if balance hits zero. I’ll make sure usage deduction is truly real time, not “almost real time,” and that calls actually stop, not politely wait. I also document everything so the system doesn’t become a mystery box later. A few quick questions: Do you prefer Asterisk ARI or raw SIP handling for call control? Should billing tick every 10 seconds exactly or round partial chunks? Best regards, Dev S.
$1.500 USD in 10 Tagen
2,7
2,7

Hello there, I understand this is an end-to-end AI VoIP call system, not a demo. Scope includes SIP-based outbound calls, real-time bi-directional AI audio, hard prepaid billing control, and a fully integrated admin dashboard that can stop calls instantly when balance hits zero. I have hands-on experience with SIP/RTP systems, real-time audio streaming (G.711, PCM), concurrent call handling, and integrating STT/TTS AI voice APIs into live calls. I’ve built systems where billing, call control, and admin logic are tightly coupled and enforced in real time. My approach is to build a single integrated system: SIP/RTP call engine with isolated sessions and non-blocking audio Real-time AI voice loop (call ↔ AI ↔ call) Prepaid billing enforced at the call engine level Admin dashboard directly wired to call state, balances, and termination logic I’m comfortable with the USD 1,200 base + USD 800 success bonus structure and delivering full scope to acceptance. I work individually, take ownership end to end, and can share relevant VoIP/AI system experience on request. Regards, Chirag
$1.200 USD in 30 Tagen
2,1
2,1

Hello, I am a Node.js Developer with 15+ years of experience in building scalable, secure, and high-performance backend systems. I specialize in RESTful APIs, real-time applications, server-side development, and database integration (MySQL, MongoDB, etc.). I focus on writing clean, optimized, and maintainable code to ensure speed and reliability. Recently, I also worked on OpenAI API integration for auto-generated articles, images, and social sharing, which highlights my ability to adopt the latest technologies into modern applications. If you are looking for a dedicated Node.js expert who ensures quality, innovation, and timely delivery, I’d be happy to work on your project.
$750 USD in 7 Tagen
1,8
1,8

✔ I deliver 100% working systems — partial demos are not my standard. ✔ Workflow Diagram SIP Credentials & Call Specs ⟶⟶ SIP / RTP Call Core Setup (Asterisk / SIP Stack) ⟶⟶ RTP Audio Capture & PCM Conversion ⟶⟶ Real-time AI Voice Integration (STT ⇄ TTS) ⟶⟶ Bi-directional Live Call Loop ⟶⟶ Prepaid Billing Engine (Real-time Deduction) ⟶⟶ Admin Dashboard Integration (Accounts, Balance, Control) ⟶⟶ Stability Testing & Multi-Call Validation ⟶⟶ Final Acceptance & Production-Ready Delivery Key Highlights ✔ True SIP-based AI calling system — outbound calls via SIP with RTP audio capture, G.711 μ-law / A-law, mono 8kHz, and live audio streaming. ✔ Bi-directional real-time audio — call audio streamed to AI (STT), AI responses returned via TTS directly into the same live call. ✔ Per-call session isolation — clean session handling with non-blocking audio streams and graceful failure recovery. ✔ Integrated prepaid billing logic — real-time balance deduction at KRW 13.72 per 10 seconds, enforced by the system itself (not manual). ✔ Role-based accounts — HQ / Distributor / Client hierarchy with activation and deactivation controls. ✔ Operational monitoring — balance view, usage summary, and call history (time, duration, deducted KRW). ✔ Stability-first delivery — basic concurrent call handling, timeout protection, and error recovery for AI APIs. Best Regards, Asad VoIP & Backend Developer | SIP / RTP | AI Voice Systems
$825 USD in 21 Tagen
1,6
1,6

Hi There!!! !!>>> THE PROJECT GOAL IS TO DEVELOP AN AI-BASED VOIP CALL SYSTEM WITH FULLY INTEGRATED ADMIN DASHBOARD <<<!! I have studied your project description very well and understand you need a stable, prepaid-controlled AI calling system with live bi-directional audio and a fully integrated admin dashboard. I am best fit for the project because I can deliver end-to-end VoIP solutions with AI integration and robust real-time control. • SIP/RTP-based outbound call handling with real-time AI voice (STT/TTS) • Prepaid balance control with immediate call blocking when balance reaches zero • Fully integrated admin dashboard for monitoring accounts, usage, and call history I will provide system design, database management, testing, source code delivery, and basic monitoring setup at the end of the project. I have 9+ years experience as a full stack developer and have built AI-driven VoIP platforms with Asterisk, Node.js, and real-time audio streaming. Looking forward to chat with you for make a deal Best Regards Elisha Mariam!
$1.010 USD in 16 Tagen
1,5
1,5

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