VoIP, otherwise known as Voice over Internet Protocol, is a digital solution for telecommunication that utilizes the transmission of voice through the use of data over the internet. This technology is typically adopted for both commercial and privately used applications. VoIP developers specialize in programming telecommunication systems using data transmission to provide efficient services for audio and video functions.

VoIP developers are highly sought after professionals as they can create a versatile and advanced system for both desktop and mobile devices. This can include creating a more interactive experience for customers with multi-way calls, conference calls, video conferencing and voicemail systems. VoIP developers can set up your business’s phone system such as forwarding calls remotely to other devices with extensions or even communicating with customers utilizing software like Callcentric, Flowroute or Voxbone.

Here's some projects that our expert VoIP Developer made real:

  • Secured and configured private networks by implementing security measures like IP SLA, NAT and ACLs
  • Integrating SIP trunks between billing platforms, PBXs and VoIP applications
  • Setting up Postfix mail server on Linux systems with TLS authentication and encryption
  • Installing and configuring sip telephony software like ASTPP into businesses
  • Developing web applications that can send and receive SMS messages utilizing VoIP APIs

Our expert VoIP Developer have created numerous projects to help business owners manage their telecommunications in a professional bet. Our developer have an array of experience in creating a secure and reliable system customized to each client demands. If you're looking to improve or create your business’ communication system, then post your project today on Freelancer.com to hire one of our skilled professional VoIP Developers today!

จาก 26,793 รีวิว ลูกค้าให้คะแนน VoIP Developers 4.83 จาก 5 ดาว
จ้าง VoIP Developers

VoIP, otherwise known as Voice over Internet Protocol, is a digital solution for telecommunication that utilizes the transmission of voice through the use of data over the internet. This technology is typically adopted for both commercial and privately used applications. VoIP developers specialize in programming telecommunication systems using data transmission to provide efficient services for audio and video functions.

VoIP developers are highly sought after professionals as they can create a versatile and advanced system for both desktop and mobile devices. This can include creating a more interactive experience for customers with multi-way calls, conference calls, video conferencing and voicemail systems. VoIP developers can set up your business’s phone system such as forwarding calls remotely to other devices with extensions or even communicating with customers utilizing software like Callcentric, Flowroute or Voxbone.

Here's some projects that our expert VoIP Developer made real:

  • Secured and configured private networks by implementing security measures like IP SLA, NAT and ACLs
  • Integrating SIP trunks between billing platforms, PBXs and VoIP applications
  • Setting up Postfix mail server on Linux systems with TLS authentication and encryption
  • Installing and configuring sip telephony software like ASTPP into businesses
  • Developing web applications that can send and receive SMS messages utilizing VoIP APIs

Our expert VoIP Developer have created numerous projects to help business owners manage their telecommunications in a professional bet. Our developer have an array of experience in creating a secure and reliable system customized to each client demands. If you're looking to improve or create your business’ communication system, then post your project today on Freelancer.com to hire one of our skilled professional VoIP Developers today!

จาก 26,793 รีวิว ลูกค้าให้คะแนน VoIP Developers 4.83 จาก 5 ดาว
จ้าง VoIP Developers

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    สถานะงาน
    15 งานที่พบ

    I need a hands-on engineer to install and fully configure a Sophos XGS 118 at our site in RITMAY BUILDERS, Ansal Villa, Satbari Road, New Delhi 110074. Both Jio and Airtel technicians are already scheduled, so you will be able to plug straight into their hand-offs and build a clean fail-over between the two uplinks. The job covers everything from mounting the appliance to finishing live traffic tests: • Physically install and cable the XGS 118 • Create dual-WAN with automatic fail-over (Jio / Airtel) • Design and apply LAN and VLAN structure • Build firewall rules, NAT, and routing that match our current network plan • Coordinate on-site with the ISP crews plus the CCTV and Lutron automation teams to ensure their remote-access requirements are met &bull...

    $90 Average bid
    พื้นที่
    $90 การประมูลเฉลี่ย
    4 คำเสนอราคา

    STRICT RULES - READ BEFORE BIDDING 1. NO BEGINNERS & NO EXPERIMENTS: If you are a beginner or looking to "experiment" and figure things out on the go, your bid will be REJECTED. You must have proven, hands-on experience with ALL of these specific devices: Cudy P2 5G Router DrayTek Vigor 2915 Router Yeastar S20 PBX We are a live production business, NOT a testing ground. If you have not actively worked with these exact models inside out, DO NOT BID. 2. THE CORE AUTOMATION GOAL (MANDATORY): We demand a 100% seamless, automated experience for the end-user. Moving in and out of the KSA office must require ZERO manual network adjustments. 3. STRICTLY ANYDESK OR ULTRAVIEWER ONLY: ALL work MUST be done remotely via AnyDesk or UltraViewer on my machine. No direct a...

    $11 / hr Average bid
    $11 / hr การประมูลเฉลี่ย
    6 คำเสนอราคา
    Japanese Phone Interpreter Needed
    4 วัน left
    ยืนยันแล้ว

    I need a skilled Japanese-English interpreter who can jump on scheduled calls and deliver real-time, over-the-phone interpretation (OPI). All sessions will take place remotely, so you just need a quiet space, a stable line or VoIP connection, and the focus to listen, render, and relay each side of the conversation accurately. Typical calls may range from short check-ins to lengthier discussions; because the exact subject matter varies, I value flexibility and an ability to research terminology quickly when something specialized pops up. Professional discretion is essential—everything shared on the line must stay strictly confidential. If you have solid experience handling OPI, can keep pace with native speakers, and are comfortable coordinating by phone, let’s talk. Please le...

    $41 Average bid
    $41 การประมูลเฉลี่ย
    4 คำเสนอราคา

    STRICT RULES - READ BEFORE BIDDING 1. NO BEGINNERS & NO EXPERIMENTS: If you are a beginner or looking to "experiment" and figure things out on the go, your bid will be REJECTED. You must have proven, hands-on experience with ALL of these specific devices: Cudy P2 5G Router DrayTek Vigor 2915 Router Yeastar S20 PBX We are a live production business, NOT a testing ground. If you have not actively worked with these exact models inside out, DO NOT BID. 2. THE CORE AUTOMATION GOAL (MANDATORY): We demand a 100% seamless, automated experience for the end-user. Moving in and out of the KSA office must require ZERO manual network adjustments. 3. STRICTLY ANYDESK OR ULTRAVIEWER ONLY: ALL work MUST be done remotely via AnyDesk or UltraViewer on my machine. No direct a...

    $250 - $750
    ปิดผนึก
    $250 - $750
    24 คำเสนอราคา

    I need a single expert who can design the architecture and then personally build an all-in-one platform that merges CRM, VoIP calling, and—most importantly—robust sales automation. Scope • CRM backbone: clean customer data structures, intuitive contact views, role-based permissions, import/export tools, and real-time search. • VoIP module: in-app softphone, call logging, recordings, click-to-dial, and number provisioning with a reliable SIP provider of your choice. • Sales automation (top priority): – Lead scoring and management that updates in real time. – Automated email campaigns triggered by behavior or pipeline stage, delivered through Mailchimp. – Visual sales pipeline tracking with drag-and-drop stages, performance dash...

    $229 Average bid
    $229 การประมูลเฉลี่ย
    47 คำเสนอราคา
    ViciDial Backend Expert Needed
    4 วัน left
    ยืนยันแล้ว

    I’m looking for someone who knows ViciDial inside-out to take full ownership of the backend. The platform is already live but it needs a deep cleanup, optimisation and several feature extensions. Here’s what I want you to tackle: • System configuration – Provision or harden the existing server stack, keep it patched and monitored – Create and maintain user accounts with the correct permission tiers – Review and fine-tune dial plan settings so campaigns hit the right ratios without stressing the dialer • Database management – Set up an automated backup and verified recovery routine – Optimise tables, indexes and queries for faster list loading and real-time reporting – Migrate legacy data from previous inst...

    $14 / hr Average bid
    $14 / hr การประมูลเฉลี่ย
    79 คำเสนอราคา
    Bilingual Customer Support Assistant
    3 วัน left
    ยืนยันแล้ว

    I run a small but busy business that sells car accessories and paint products, and I now need help staying on top of our growing customer base. Your main focus each day will be direct customer communication—answering questions, taking orders, arranging follow-ups, and generally making sure every buyer feels heard and well looked after. We work with customers in both Spanish and English, so you must speak and write both languages fluently. Expect to move seamlessly between English-speaking body-shops in the U.S. and Spanish-speaking wholesalers in Latin America. Channels you will handle • Email • Phone calls (I’ll provide a VoIP line) • Live chat on our website and social media inboxes Beyond front-line contact, I’ll count on you to log each i...

    $372 Average bid
    $372 การประมูลเฉลี่ย
    18 คำเสนอราคา

    I’m rolling out a new Asterisk-based PBX that spans both an on-prem rack server and a small cloud instance. I need a specialist who can take the project from a clean slate to a fully functional, production-ready system. Here’s what I’m expecting: • Complete installation of the latest stable Asterisk on each node (one local, one cloud) with SIP trunks registered and ready. • Seamless call routing between sites, extension dialing, voicemail, IVR, and basic queue logic operating flawlessly across the hybrid topology. • Secure configuration—TLS/SRTP, strong authentication, sensible firewall rules, fail-over settings between the two servers. • Real-time monitoring and alerting set up (Nagios, Zabbix, Grafana, or a tool you’re comfortable ...

    $446 Average bid
    $446 การประมูลเฉลี่ย
    41 คำเสนอราคา

    My customers frequently need real-time assistance that also moves them toward a purchase, so this project combines classic customer support with a clear sales emphasis. The core task is to place cold calls to brand-new prospects, answer their questions in a friendly, knowledgeable manner, and guide them toward the right product or service. Scope of work • Dial cold prospects from the list I provide, following the approved script while sounding natural and engaging. • Offer “Sales” style customer support—every conversation should both resolve the caller’s inquiry and create momentum toward closing a deal. • Record each outcome (interested, not interested, callback requested, converted) in my CRM the same day. • Flag any technical or billi...

    $75 Average bid
    $75 การประมูลเฉลี่ย
    13 คำเสนอราคา
    Dinstar UC2000-VE-4T + FreePBX/Asterisk + Retell AI Voice Setup
    2 วัน left
    ยืนยันแล้ว

    Dinstar UC2000-VE-4T + FreePBX/Asterisk + Retell AI Voice Setup Project Description We are looking for an experienced individual VoIP/Asterisk freelancer to configure a small business telephone system. Hardware available: Dinstar UC2000-VE-4T LTE/VoLTE Gateway 2 mobile SIM cards initially 4 available gateway channels Required configuration: Install and configure FreePBX/Asterisk Configure the Dinstar UC2000-VE-4T with 2 SIM cards Create two completely independent inbound/outbound call routes Configure two remote SIP softphone users working from PCs/mobile phones Each user must make and receive calls through their assigned SIM/number Incoming caller ID should be passed correctly to the remote user Configure correct outbound routing so each user always calls through their assi...

    $70 Average bid
    $70 การประมูลเฉลี่ย
    11 คำเสนอราคา
    Facebook Lead Gen & QA Caller
    2 วัน left
    ยืนยันแล้ว

    I run several online projects that rely heavily on a steady flow of qualified leads and consistent customer-service standards. To keep both streams healthy, I need help in two connected areas: Social media lead generation You will live inside Facebook groups that match my target audiences, locate new groups worth joining, and schedule or publish a mix of informational and engagement posts that move prospects toward my offer. Once comments or direct messages come in, you’ll handle the first response, answer common questions, and flag hot prospects for me. A fast, reliable internet connection and clear spoken English are essential because speed and tone make all the difference here. Although the initial focus is Facebook, there’s room to branch into LinkedIn or Instagram as re...

    $5 / hr Average bid
    $5 / hr การประมูลเฉลี่ย
    43 คำเสนอราคา
    Backend Developer for Chat App Features
    1 วัน left
    ยืนยันแล้ว

    We are seeking an experienced Backend Developer to implement new messaging, media, privacy, and VoIP signaling, Screen Sharing features into our existing WhatsApp-like communication platform. Tech Stack: Backend: Node.js, Fastify, PrismaORM, MySQL Real-time & Media: WebSockets, Mediasoup (Audio/Video calls) Note: You will only be responsible for the backend development (REST APIs, WebSocket events, database schema updates, background jobs, and Mediasoup signaling). Our mobile development team will handle all front-end/app integration. 1. Chat & Messaging Module** * **Message Reactions & Replies:** * Add API endpoints and WebSockets/Socket events for attaching reactions (emoji) to specific `message_id`s. * Support threaded replies by referencing `parent_message_id` in the me...

    $477 Average bid
    $477 การประมูลเฉลี่ย
    212 คำเสนอราคา
    Cloud Call Recording System Setup
    1 วัน left
    ยืนยันแล้ว

    I run a busy telemarketing agency and need a reliable, scalable way to record every outbound call my team makes from their desktop computers. I’m committed to a fully cloud-based solution so we never have to maintain on-premise hardware, yet I still want enterprise-grade security, redundancy, and easy access to recordings. The core requirements are straightforward: • Automatic call recording that captures 100 % of outbound traffic the moment a call is placed. • Built-in call analytics so I can track agent performance, campaign effectiveness, and compliance metrics from a central dashboard. Beyond those essentials, the platform should let me search, tag, and download recordings quickly, with the option to add real-time transcription down the road. Seamless integration...

    $152 Average bid
    $152 การประมูลเฉลี่ย
    81 คำเสนอราคา
    Bilingual Personal Injury Cold-Call Closers
    4 ชั่วโมง left
    ยืนยันแล้ว

    We are looking for 2 reliable remote callers to handle personal-injury intake calls for our Texas campaign. We provide fresh prospect data with the client's name, phone number, vehicle details, and exact accident date/time. Your job is to call, qualify the prospect, and live-transfer qualified, ready-to-move-forward clients to our intake attorneys. Requirements: * Fluent English and Spanish * Excellent communication and phone skills * Experience with personal injury intake, legal intake, or paralegal work preferred * Vicidial experience is a strong plus * Able to follow a script while building genuine rapport * Confident handling questions and objections * Reliable internet and a good headset Schedule: 8 AM - 12 PM Central Time We are also open to part-time paralegals with perso...

    $28 / hr Average bid
    $28 / hr การประมูลเฉลี่ย
    6 คำเสนอราคา
    Part-Time English Telecaller Support
    1 ชั่วโมง left

    I’m looking for a friendly, fluent-English telecaller who can step in a few hours each day and take great care of our existing customers. Your role is strictly customer support—no cold sales—so the focus will be on answering general service questions, guiding callers through basic processes, noting feedback, and making sure every conversation ends on a positive note. You’ll work from a call list I provide, use our cloud-based CRM to log interactions, and handle calls through our VoIP dialer. Training materials, a call script outline, and escalation contacts are all ready; what I need is your clear voice, active listening, and knack for resolving everyday issues quickly. Typical shift requirements sit at 3–4 hours, Monday to Friday, with some flexibility to s...

    $17 / hr Average bid
    $17 / hr การประมูลเฉลี่ย
    13 คำเสนอราคา

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