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!

From 25,330 reviews, clients rate our VoIP Developers 4.8 out of 5 stars.
Hire 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!

From 25,330 reviews, clients rate our VoIP Developers 4.8 out of 5 stars.
Hire VoIP Developers

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    23 jobs found

    I’m looking to partner with a reliable call-centre operation that can dedicate 1 – 5 agents exclusively to inbound customer support over the phone. All interactions will be in English, so clear diction and a neutral accent are essential. The agents will be the first point of contact for my customers, answering questions, resolving basic issues, and routing complex cases to my in-house team when needed. Average volume is modest right now, but I need a team that can scale quickly if call traffic grows. Core expectations • Live phone coverage during the agreed shift window • Courteous, solution-focused conversations that follow my brand guidelines • Real-time ticket or CRM updates so I always know the status of each call • Daily call logs and a conc...

    $349 Average bid
    $349 Avg Bid
    6 bids

    We are looking for an experienced developer or development team to build an Omni-Channel Dialer Platform that allows customers to communicate with us through multiple channels from a unified system. The system should allow customers to connect through their preferred communication channels such as: Voice Calls (Inbound & Outbound) Video Calls Email SMS Social Media Messaging Platforms: Facebook Messenger Twitter / X Instagram WhatsApp The platform must integrate with our Voice Bot Platform through API or Webhooks so that calls and conversations can be routed to our bot when required. Core Features Required: Omni-Channel Communication Unified dashboard for all channels Real-time conversation management Incoming and outgoing communication support CRM Integration Built-in Customer CRM ...

    $752 Average bid
    $752 Avg Bid
    15 bids
    ISSABEL VOIP
    5 days left
    Verified

    Project Title: Full Issabel 5 PBX Deployment: Installation, Trunks & Extensions Project Overview I am seeking a VoIP specialist to perform a complete installation of Issabel 5 on an AlmaLinux 8 cloud instance. Beyond the base installation, the freelancer will configure the initial telephony architecture, including SIP trunks for external connectivity and internal extensions for users. Detailed Scope of Work 1. Server Installation & Hardening Perform a clean installation of Issabel 5 on AlmaLinux 8 using the official net-install script. Configure Fail2ban and firewall rules to block unauthorized SIP and SSH attempts. Set secure passwords for the Linux root, MariaDB, and Issabel web admin. 2. SIP Trunk Configuration Connect the PBX to my chosen VoIP provider using a SIP trunk....

    $63 Average bid
    $63 Avg Bid
    12 bids

    I don't have FusionPBX installed on any server yet. You will install and setup fusionpbx on a server I will provide credentials access into. I want to be able to present a specific caller ID on every outbound call placed from my softphone. The softphone I will be using is Linphone, so everything you build must be fully tested from that app before we wrap up. What I need you to do • Configure the relevant SIP profile(s) and outbound route so that the number I supply appears consistently, regardless of the device extension that initiates the call. • Make any dial-plan or gateway adjustments required for a typical commercial SIP trunk. I have not fixed on one provider yet, so keep the setup provider-agnostic and document the few fields I will have to tweak once I decide. ...

    $59 Average bid
    $59 Avg Bid
    8 bids

    Virtual Assistant / Phone Support for Wellness Clinic (4 hrs/day MST) Project Description I am the owner of a wellness clinic and mobile health services company. I am looking for a reliable virtual assistant from Latin America to help with phone support, appointment scheduling, and social media interaction. This is a long-term part-time position for someone who can work US Mountain Time mornings. Work Schedule Monday – Friday 8:00 AM – 12:00 PM Mountain Standard Time (MST – Colorado USA) Approximately 20 hours per week Main Responsibilities Phone Support Answer incoming calls from clients Respond professionally and friendly Schedule appointments Answer basic service questions Appointment Scheduling Book appointments in our booking software Confirm appointments Send re...

    $9 / hr Average bid
    $9 / hr Avg Bid
    44 bids
    Outbound Voice AI Scheduler
    3 days left
    Verified

    I need an outbound voice AI that can pick up the phone, speak naturally with customers, and lock in service appointments without human involvement. The bot should dial leads from a list, confirm the customer’s need for our service, offer available slots pulled from an online calendar, secure the booking, and then push the confirmed appointment back to our CRM while sending the customer a confirmation SMS or email. Core flow • Call initiation through a voice gateway such as Twilio • Speech recognition and NLU (Dialogflow CX, Amazon Lex, Rasa, or similar) to understand the caller’s intent, handle clarifying questions, and gracefully manage “I didn’t catch that” moments. • Text-to-speech that sounds human; Google WaveNet, Amazon Polly or Micro...

    $743 Average bid
    $743 Avg Bid
    192 bids

    I need a streamlined website whose sole function is to host and manage a voice-based AI call-center. The site will act as the control panel and public-facing entry point for customers who dial in, while giving me an admin area to configure and monitor activity. Core requirements • Automated responses: callers must hear natural-sounding, AI-generated answers that pull from a knowledge base I can update myself. • Live call routing: when the AI decides human help is needed, it should hand the caller off to a live agent instantly and log the transfer. • Voice channel only: chat or email may be added later, but right now the system must excel at telephone interactions. Technical expectations – Cloud telephony integration (Twilio, Plivo, or similar) for SIP/VoIP ha...

    $1684 Average bid
    $1684 Avg Bid
    73 bids

    A Direct Sales / Sales Coordinator. We've been established 17 years. We are in the early stages of rebuilding, expanding the company. After contracting due to the pandemic. We have been running stsbly. We are now looking to build a team. I've been running most aspects of the company over the last couple of years, but due to expansion, the workload is growing. I'm an expert in direct sales, sales trainer, team builder, motivator, that's pretty much what I do. And marketing as well. I've developed some unique concepts, which I mentor self employed ambitious people. I train mindset and work ethic and develop communication skills and general business skills. I'm looking for somebody to join the team, to work remotely. bit of a split role, so somebody ...

    $818 Average bid
    $818 Avg Bid
    10 bids

    I need a fully-functional Google Voice account for 10 Users supported, registered from India but tied to a U.S. phone number, so I can place and receive personal calls to and from the States. The account itself does not yet exist and I have not picked a number, so part of the job is guiding me through—or handling—the selection of an available U.S. number that feels natural to me. Because Google Voice is officially unsupported here, you’ll have to take care of the usual hurdles (VPN, verification SMS to a real U.S. mobile, billing profile if required) and then hand over a clean login that I can secure with my own 2-step authentication. I plan to use the service interchangeably on both my smartphone and my laptop, so please configure and test calling on the Google Voice mo...

    $3 / hr Average bid
    $3 / hr Avg Bid
    6 bids

    I want to browse safely from any hotel or coworking space by tunnelling all my traffic back to a small VPN server that will live in my house. The job has two parts: • Hardware advice – point me to a compact, reliable travel router and the best-value home server (could be a Raspberry Pi, mini-PC, dedicated router or NAS) plus any cables, power adapters, or memory cards I should add to the shopping cart. • Full setup – install and configure the VPN on the home unit, flash/configure the travel router, and hand me clear, copy-paste-ready instructions for connecting both my laptops/desktops and my iOS/Android phones. Secure browsing is the main goal, so strong encryption, a clean firewall policy, and DNS leak protection are mandatory. I’m flexible on protocol; if...

    $252 Average bid
    $252 Avg Bid
    40 bids

    I need an IPRN switch brought online fast, fully wired for billing integration and ready to carry live traffic. The core signalling will run over SIP, so every module you build or configure must interoperate cleanly with SIP endpoints and the upstream carrier trunks I already have in place. Billing is the priority: once a call lands on the switch the CDRs must flow straight into our existing rating platform without manual touches. I am open to whether you plug in a ready-made mediation layer or write custom logic—what matters is that usage records appear in real time and reconcile correctly at the end of each day. You will get SSH access to a fresh cloud instance plus the credential set for my billing server. I expect you to: • Deploy or compile the soft-switch software, enab...

    $77 Average bid
    $77 Avg Bid
    3 bids

    I already have a Contabo server standing by and simply need a clean, production-ready ViciDial stack on it. The job covers: • Installing the latest stable ViciDial (with Asterisk and its dependencies) from scratch. • Optimising the underlying Linux distro you feel is most reliable for call-centre workloads. • Hardening the box with a well-tested firewall configuration—CSF, UFW, iptables, or a similar solution is fine—as long as only the ports Vicidial, SSH and web administration actually require remain open. • Verifying that the web interface, database, and telephony services all start automatically after a reboot and that calls can be placed through a demo campaign. • Supplying a concise hand-off sheet: all commands run, credentials created, a...

    $47 Average bid
    $47 Avg Bid
    18 bids

    I manage a growing Zoom Phone deployment and need an expert who can jump in immediately to refine the advanced configuration. The priorities are: • Call routing – redesign the logic so every call reaches the correct team without bouncing or unnecessary transfers. • IVR – build intuitive, multi-level auto-attendants that shorten wait times and direct callers accurately. • Reporting & analytics – surface real-time and historical data that highlights call volumes, wait times, and agent performance so I can act on trends quickly. My end goal is to improve handling efficiency, guarantee that calls land in the right department first time, and cut customer wait times. On top of that, I’d like guidance (and scripts if possible) to automate routine o...

    $47 / hr Average bid
    $47 / hr Avg Bid
    14 bids

    I need a native Spanish speaker from Latin America who can cover both live-chat and phone inquiries with equal dedication. The work is fully remote and spans 48 hours each week, with the first week serving as a paid trial so we can be sure everything runs smoothly. Here’s the workflow you’ll follow: • Greet customers in Spanish, clarify their questions, and resolve issues through our chat console and VoIP line. • Adhere to the simple scripts and step-by-step guidelines I’ll provide. • Keep a concise activity log at the end of each shift so we can track resolved cases and any follow-ups. What I’m looking for: • Native-level Spanish from a Latin American country. • Clear, friendly speaking voice and solid written grammar. • Reli...

    $209 Average bid
    $209 Avg Bid
    34 bids

    My organization is looking for a telephony tech in the Saskatoon, SK to connect a Grandstream ATA to an Avaya IP Office system. The primary objective is to move two existing fax numbers—306-934-5787 and 306-955-3059—onto the ATA so they send and receive reliably through the PBX. The job covers: • Physically or remotely provisioning the Grandstream ATA, assigning it an internal extension, and ensuring it communicates correctly with Avaya IP Office. • Mapping both fax numbers to the ATA ports and confirming successful inbound and outbound fax transmission. • Providing a brief record of any IP Office or Grandstream settings you change so I can reference them later. Acceptance is complete when both fax lines pass test sends and receives without errors.

    $75 / hr Average bid
    $75 / hr Avg Bid
    12 bids

    I’m looking to have a fully-functional AI receptionist built that can pick up every inbound call, hold a natural conversation with the caller, and then route the call to the right person or department purely on the basis of what the caller actually says. The key outcomes I need are: • Advanced conversational AI – the system must go well beyond simple keyword spotting and understand context, intent, and follow-up questions so the interaction feels human. • Dynamic query-based routing – once the caller’s need is clear, the AI should transfer the call to the appropriate extension or external number automatically. • Clean hand-off – when the call is routed, the receiving party must get a short, accurate summary of the caller’s request...

    $803 Average bid
    $803 Avg Bid
    23 bids
    MS365-Cloud & VoIP Support
    1 day left
    Verified

    I run a growing small business that relies on Microsoft 365 and a cloud-based VoIP phone system. I’m looking for a dependable partner who can step in as our day-to-day IT resource, keeping both environments running smoothly while I focus on the business itself. Most of the work is remote and ongoing. Typical tasks include adding or removing users, managing licences, tightening security policies, monitoring storage limits, resolving sync or mail-flow problems, and fine-tuning Teams, OneDrive, SharePoint, and Exchange whenever needed. On the voice side, I’ll call on you for new handset or softphone rollouts, call-flow changes, SIP or trunk tweaks, quality-of-service checks, and the occasional deep dive when call quality drops. I value quick response times, clear communicati...

    $50 Average bid
    $50 Avg Bid
    17 bids
    Vicidial SIP & Campaign Setup
    16 hours left
    Verified

    My Vicidial server is already installed, secured, and reachable from the public internet; what’s missing is the practical know-how to make calls and launch the very first blended (inbound + outbound) campaign. Here is what I need you to walk me through and, where necessary, configure directly on the box: • Register my SIP-trunking provider inside Vicidial, confirm two-way audio, and run a quick live test call. • Create one blended campaign with at least a test list, DID routing for inbound, and the appropriate dial plan entries for outbound. • Show me, via screenshare or concise step-by-step notes, how to add new agents, upload lead lists, record custom greetings, and monitor live calls so I can repeat the process after you leave. Acceptance criteria – S...

    $638 Average bid
    $638 Avg Bid
    18 bids
    Call Center Survey Manager
    11 hours left
    Verified

    This project centers on running outbound phone surveys designed strictly for market-research purposes. I will supply the calling lists, scripts, and an online dashboard; your role is two-fold. First, you will act as the front-line caller, reaching respondents, following the scripted questionnaire word-for-word, and logging every answer in the CRM in real time. Second, you will step in as a light manager: tracking daily metrics, giving quick feedback to any new callers we add, and suggesting script tweaks when response rates dip. A friendly, confident voice, solid English, and prior experience with VoIP dialers such as Five9, Dialpad, VICIdial, or a similar cloud system keep the workflow smooth. You will need a quiet place to work, a reliable headset, and steady internet so call quality ne...

    $16 / hr Average bid
    $16 / hr Avg Bid
    41 bids
    WebRTC Asterisk TLS Auth Fix
    7 hours left
    Verified

    I have a WebRTC soft-phone built with JsSIP that needs to register to an Asterisk 18 server over WSS. SIP credentials are confirmed correct, yet the browser console shows an authentication failure. The signalling path is protected with TLS certificates, so the problem is somewhere in the certificate handling or the way Asterisk presents the challenge. Your job is to trace and eliminate the registration failure, then hand back a clean configuration and proof that the client can successfully register and place a test call. Environment details you will touch: – Asterisk 18 (pjsip stack enabled) – JsSIP running in a standard browser (wss://) – TLS with server and client certificates already issued Acceptance criteria: • JsSIP completes REGISTER without 401/403 r...

    $30 Average bid
    $30 Avg Bid
    33 bids

    Mam na wÅ‚asnym VPS zainstalowanÄ… najnowszÄ… wersjÄ™ GoAutoDial 4. PotrzebujÄ™ specjalisty, który poprawnie skonfiguruje połączenie z moim dostawcÄ… SIP trunk – Zadarma – tak, aby system bezbłędnie realizowaÅ‚ zarówno połączenia wychodzÄ…ce, jak i odbieraÅ‚ przychodzÄ…ce. Zakres prac: • dodać i zweryfikować trunk Zadarma, • utworzyć odpowiednie dial-plany i reguÅ‚y routingu, • przeprowadzić testowe połączenia w celu potwierdzenia jakoÅ›ci oraz stabilnoÅ›ci, • wprowadzić ewentualne korekty konfiguracji serwera Asterisk wchodzÄ…cego w skÅ‚ad GoAutoDial. Åšrodowisko obejmuje jeden VPS, wiÄ™c konfiguracja dotyczy pojedynczego serwera. Po zakoÅ„czeniu proszÄ™ o krótkÄ… instrukcjÄ™ krok-po-kroku, abym mógÅ‚ samodzielnie zarzÄ…dzać podstawowymi zmiana...

    $26 Average bid
    $26 Avg Bid
    6 bids

    Necesito conectar nuestro PMS Cloud con la centralita Asterisk para cubrir funcionalidades de gestión de hotel. El objetivo es que el personal pueda manejar desde el PMS: • Registro de huéspedes: que cada check-in o check-out actualice automáticamente el estado de la extensión telefónica asignada. • Asignación de habitaciones: que al cambiar una habitación en el PMS se reprograme la extensión correspondiente en Asterisk sin pasos manuales. • Facturación y pagos: que las llamadas salientes e internas se registren en la cuenta del huésped y se reflejen en la factura final. Ya contamos con un software específico de gestión hotelera en la nube; requiero que el integrador trabaje sobre sus A...

    $660 Average bid
    $660 Avg Bid
    50 bids

    Busco a una persona que trabaje desde casa atendiendo a nuestros clientes exclusivamente por teléfono. La tarea principal consiste en recibir llamadas entrantes, comprender la situación del usuario y ofrecer una solución eficaz al problema planteado. Valoro especialmente la capacidad de escucha activa, un tono cordial y una clara orientación a la resolución de problemas; no se trata solo de seguir un guion, sino de pensar con rapidez y empatía. Necesito que tomes nota de cada interacción en nuestro CRM y escales los casos que requieran seguimiento técnico avanzado. Entrego: • Acceso al sistema telefónico VoIP y al CRM. • Capacitación básica sobre el producto y las preguntas frecuentes. Esper...

    $27 / hr Average bid
    $27 / hr Avg Bid
    76 bids

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