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!

24,426レビューから、クライアントは VoIP Developers 4.8/5個の星で評価します。
VoIP Developers を採用する

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!

24,426レビューから、クライアントは VoIP Developers 4.8/5個の星で評価します。
VoIP Developers を採用する

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    29 見つかった仕事

    WebRTC Call Recording Issues in Desktop Dialer (JsSIP) We are working on a desktop VoIP dialer built using JsSIP and WebRTC and are facing multiple issues related to audio call recording that need to be analyzed and fixed. Issues Observed 1. Conference Call Recording Controls o User-facing Start / Stop recording buttons do not work reliably during conference calls. o Recording sometimes does not include all participants or does not stop correctly. 2. Critical: Background Audio Recording o Audio recording sometimes continues or restarts without explicit user action or permission. o This is a privacy and browser policy compliance issue and must be handled strictly via user consent and proper MediaStream cleanup. 3. Recording Failure During Multiple Calls o When handling multiple or consecuti...

    $11 / hr Average bid
    $11 / hr 平均入札額
    7 入札

    I'm looking for someone to read a casual voicemail script for our company. Requirements: - Record a casual-toned voicemail - Include company name and callback details - Prompt callers to call our service number Ideal Skills: - Clear voice - Good pronunciation - Experience with casual tone voiceovers Please provide a sample of your voice. this will be the script “Hi, you’ve reached Fuzion3. We’re not available at the moment, but we’d still love to help. For immediate service, please call our concierge team at 949-539-4933. Thanks for calling!”

    $85 Average bid
    $85 平均入札額
    12 入札

    This role handles both inbound and outbound calls with the primary goal of converting existing leads and customer orders into completed invoice payments. The position focuses on speed, accuracy, strong communication, and strict process adherence — not cold selling. Requirements: - Fluent, professional English proficiency - High tonality, confident speaking voice - Ability to work a minimum of 8 hours per workday Core Responsibilities: - Call new and existing leads daily and follow strict call priority protocols - Convert phone and email orders into completed invoice payments - Follow scripts word-for-word and maintain compliance standards - Send invoices, confirm order details, and resolve basic objections - Log all activity accurately in CRM and internal systems

    $7 / hr Average bid
    $7 / hr 平均入札額
    17 入札

    I need a one-time, end-to-end configuration of GoHighLevel that lets my commercial cleaning team run outbound appointment-setting calls without touching websites or funnels. The essentials I’m after are: • Provision local phone numbers inside GoHighLevel, fully linked to a calling system that supports call tracking and recordings. • Build a straightforward outbound pipeline that moves prospects from first dial through booked walkthrough appointments. • Enable automatic email confirmation and SMS confirmation for every appointment. • Integrate our existing contact list so my remote telemarketers can start dialing immediately. • Create a shared calendar specifically for walkthroughs, with the correct availability settings. • Add user accounts an...

    $511 Average bid
    $511 平均入札額
    32 入札

    I need an experienced VoIP specialist to configure my on-premises Polycom phones for use with RingCentral. Key requirements: - Configure SIP settings, network settings, and user extensions specifically for RingCentral integration. - Ensure all phones are fully operational and can seamlessly connect to RingCentral services. Ideal skills and experience: - Expertise in configuring Polycom VoIP phones. - Proficiency with RingCentral and understanding of its specific configuration requirements. - Strong networking knowledge to handle any required network settings adjustments. - Prior experience with on-premises VoIP systems is a plus.

    $839 Average bid
    地方
    $839 平均入札額
    8 入札

    I need an end-to-end implementation of Zoom Contact Center. The project covers designing, configuring, and launching the full environment so my team can handle Live chat, Voice calls, Video calls, traditional Email tickets, and inquiries triaged by the Zoom Virtual Agent—all from the same pane of glass. Scope Right now I have Zoom licences in place but no contact-center instance configured. I want you to build the entire workflow: inbound routing rules, IVR menus, chat and video queues, email hand-off, skill-based distribution, and the knowledge base that powers the Virtual Agent. SSO must be enabled and user roles defined so agents, supervisors, and admins see only what they need. Basic dashboard and historical reports should be ready from day one. Tools & integrations You wil...

    $1198 Average bid
    $1198 平均入札額
    43 入札

    Preciso de alguém que assuma o atendimento ao cliente exclusivamente por telefone, em português, oferecendo um serviço acolhedor, claro e resolutivo. A tarefa envolve ouvir as dúvidas ou reclamações, orientar o cliente até a solução adequada e registrar cada interação de forma organizada. O que preciso que você faça: • Receber chamadas através da linha ou plataforma que indicarei. • Prestar atendimento ao cliente (não vendas nem suporte técnico) de maneira cordial e objetiva. • Registrar dados essenciais e resumo da conversa em planilha ou CRM que disponibilizo. • Sinalizar imediatamente qualquer situação que exija escalonamento. Requisitos...

    $377 Average bid
    $377 平均入札額
    13 入札
    Open Source Linux Fax Server
    5 日 left
    認証済み

    I need an open-source fax solution deployed on a Linux host so I can both send and receive faxes from the network. Every incoming fax must be archived automatically as a PDF, and all administration—including queue monitoring, user setup, and log review—has to be handled through a clean, browser-based interface. Any stack that meets those points is fine Like ICTFax as long as it runs on a recent Debian/Ubuntu or CentOS release with no licensing fees. I will supply SSH access to a fresh VM and either a Class 1/2 USB modem or a T.38 SIP trunk you can register against. Fax server installation & system hardening SIP trunk / FoIP gateway integration Incoming & outgoing fax routing and testing Web-based fax send, receive & management Automatic PDF conversion for all...

    $211 Average bid
    $211 平均入札額
    27 入札
    Two-Way Call Connectivity Test
    5 日 left
    認証済み

    ** ONLY AFRICAN LOCAL PERSONS ALLOWED. NO OTHER NATIONALITY ** I need to confirm voice routing between Pakistan and Africa. The task is genuinely simple: be in any African country, keep your local SIM active—MTN, Airtel, Orange or whichever operator you normally use—and be ready for two short calls. 1. I will dial your mobile from my Jazz network in Pakistan; you just pick up and confirm the audio is clear. 2. You then return the call to a Pakistan number I provide. That’s it—one successful incoming, one successful outgoing call. Total talk time is under one minutes and I release the fixed $10 as soon as both legs are verified. Please bid only if you are physically within an African country and can complete the test immediately.

    $19 Average bid
    $19 平均入札額
    15 入札

    I need a fluent English speaker who can jump straight into handling both inbound and outbound calls with our business partners. The role sits at the intersection of customer happiness and light technical troubleshooting, so you’ll spend most of your day guiding partners through product-related questions, documenting each interaction in our CRM, and making sure every conversation follows the script and brand tone I’ll provide. Because you’ll be the first voice many partners hear, I’m looking for someone who stays calm when lines are busy, keeps notes organised, and can translate a technical answer into plain language on the fly. Prior technical support experience is essential—if you’ve ever walked someone through a configuration step or explained why a...

    $31 / hr Average bid
    $31 / hr 平均入札額
    43 入札
    Ubuntu Airtel SIP Initial Setup
    5 日 left
    認証済み

    I need a proven Airtel Black SIP configuration running on my Ubuntu machine and handled through Linphone. The goal is a clean, documented initial setup—no trial-and-error learning on my system, please. If you have already registered an Airtel SIP trunk on Linux, you’ll know the exact registrar format, the unusual port mapping Airtel uses, and the little tweaks that keep audio flowing both ways behind NAT. Here’s the workflow I’m expecting: • Install or verify the latest Linphone and any required dependencies on my Ubuntu box. • Register the Airtel Black SIP account, applying the correct proxy, authentication string, and codec priorities. • Prove the setup with at least one inbound and one outbound call (I can join you on a test call). •...

    $34 Average bid
    $34 平均入札額
    3 入札

    engo que hacer un proyecto en Packet Tracer sobre la conexión de redes de la empresa COCACOLA, el proyecto consta de 3 lans que se conectan para hacer una WAN esta la lan matriz de 4 pisos, la lan sucrusal de 2 pisos y la lan fabrica El data center de la empresa se encuentra en la matriz en el segundo piso, en la matriz cada piso tiene su propio DIF, en la sucursal hay un único DIF para los 2 pisos El proyecto debe ser escalable, debe tener costo-beneficio adecuado, debe tener redundancia para las seguridad. Matriz: Piso 1: 6 pc (1 pc pertenece a la venta de helados y vigilancia de inventario, 1 pc de gestión de panaderia y vigilancia del mostrador, 2 pc de autogestión para que el empleado pueda visualizar sus roles y turnos, 2 pc estacion de logística ...

    $160 Average bid
    $160 平均入札額
    4 入札

    I run a sales‐driven business and need an experienced call assistant to handle our inbound and outbound sales calls exclusively focused on qualifying leads. Every conversation should uncover whether the caller genuinely needs our product; that single criterion is what matters most to us at this stage. Here’s the flow I expect: pick up or dial, briefly introduce the brand, ask the discovery questions I’ll provide, gauge the prospect’s need, and then record outcome notes in the shared CRM. No pitching, demos, or order processing—just clear qualification so my closers can step in with confidence. You should be comfortable working from a concise script, updating fields in HubSpot (or a similar tool), and keeping call summaries neat and timely. Calls will be routed...

    $245 Average bid
    $245 平均入札額
    9 入札

    My Panasonic Ns500 PBX sits on but cannot “see” the rest of my network. Everything else flows through a FortiGate 60F firewall, a FortiSwitch 424E-Fiber core, and a FortiSwitch 124F-FPOE at the edge. I need someone to shape the network so this Panasonic box can handle VoIP communication smoothly. What I already know • The PBX will run pure SIP. • Dedicated VoIP rules on the FortiGate are required; simple, generic access is not enough. What I need from you • Review the current FortiGate policy set, VLAN layout, and switch port profiles. • Create or adjust firewall rules, NAT, and any SIP ALG or helper settings so that SIP registration, signalling, and RTP streams pass without one-way audio or dropped calls. • Tag or untag the appropriate swi...

    $445 Average bid
    $445 平均入札額
    21 入札

    We are looking for an experienced React Native developer to help build and integrate a VoIP calling SDK into an existing mobile application. This is not a basic app development task. We need someone who has real experience with VoIP / WebRTC / SIP / SDK-level work and can deliver quickly. ### Project Scope - Integrate and extend a React Native VoIP SDK - WebRTC calling using - Inbound & outbound call handling - Push notification based incoming calls - Background call handling - App-based configuration dialing logic - SDK-style packaging + documentation support Our team will handle: - OpenSIPS / SBC (Call logic) - SIP infrastructure - APIs You will handle: - React Native SDK layer - Mobile VoIP calling integration - Native module bridging if required - Call UI handling - Stabili...

    $491 Average bid
    $491 平均入札額
    22 入札

    Your bid MUST include answers to the 5 questions at the bottom of this posting or it will be immediately rejected. We're a UK-based eSIM and mobile network company launching a branded international calling service. We need an experienced developer to fork, rebrand, and customise the WebTrit Phone open-source softphone app and get it published to both app stores. IMPORTANT: Read this entire posting carefully. There are specific questions at the bottom you MUST answer. Generic proposals will be rejected immediately. What is WebTrit? WebTrit Phone is a Flutter/Dart softphone app that uses WebRTC for voice and video calling. It connects to SIP-based VoIP systems via a REST API. The full source code is available on GitHub. What We Need Done Phase 1 — Fork & Rebrand Fork the Web...

    $506 Average bid
    $506 平均入札額
    93 入札

    I'm looking for a skilled developer to create a customer service voice agent using Eleven Labs technology. The agent will primarily handle answering queries. The voice agent needs to be integrated into the following platforms: - Phone system - Website - Mobile app Ideal Skills and Experience: - Experience with Eleven Labs voice technologies - Proficiency in voice agent development - Strong integration skills for multiple platforms - Background in developing customer service solutions

    $83 Average bid
    地方
    $83 平均入札額
    3 入札

    Hi, I want to redesign only agent UI, not admin. See attached. ONLY BID IF YOU HAVE REDESIGN VICIDIAL AND SHOW ME PROOF

    $25 / hr Average bid
    $25 / hr 平均入札額
    10 入札

    I’m looking for a reliable ViciDial pro who can jump in each day and keep my dialer running smoothly. The core of the job is straightforward but must be done consistently: • Run the standard performance and list-based reports I specify, download them, and drop them in our shared folder before end of day. • Import new lead files (CSV) as they arrive, map fields correctly, and verify the list is live. • Check that every active campaign’s leads are sitting in the hopper in the right quantities so agents never run dry. If a hopper is empty—or about to be—top it up and ping me in Slack. Everything is handled remotely; you’ll just need a stable connection, a headset for quick follow-up calls if questions arise, and solid familiarity with the Vic...

    $5 / hr Average bid
    $5 / hr 平均入札額
    10 入札
    Daily ViciDial Voip Admin Support
    3 日 left
    認証済み

    I’m looking for a reliable ViciDial pro who can jump in each day and keep my dialer running smoothly. The core of the job is straightforward but must be done consistently: • Run the standard performance and list-based reports I specify, download them, and drop them in our shared folder before end of day. • Import new lead files (CSV) as they arrive, map fields correctly, and verify the list is live. • Check that every active campaign’s leads are sitting in the hopper in the right quantities so agents never run dry. If a hopper is empty—or about to be—top it up and ping me in Slack. Everything is handled remotely; you’ll just need a stable connection, a headset for quick follow-up calls if questions arise, and solid familiarity with the Vic...

    $14 / hr Average bid
    $14 / hr 平均入札額
    12 入札

    Hiring: Lead QA Automation Engineer – IVR / Contact Center (Remote) Key Skill: Hammer Automation (Mandatory) ***If you have strong IVR testing and Hammer experience, we would like to hear from you***** We are looking for an experienced QA Automation Engineer with strong skills in IVR testing and Hammer to connect with one person and connect with him daily helping work Requirements min 5+ years of experience in IVR / Contact Center testing Strong hands-on experience with Hammer (must-have) Experience with Genesys Cloud or similar platforms Manual and Automation Testing experience API Testing (Postman / Rest Assured) SQL for database validation Experience with Azure DevOps / Jira Knowledge of Agile/Scrum methodology Must be willing to coordinate and work closely with anot...

    $753 Average bid
    $753 平均入札額
    16 入札

    I’m completing a networking and security module at school and the current assignment requires a fully-configured Cisco Packet Tracer project. If you’ve tutored or prepared Packet Tracer or such kind of assingment please help me

    $11 / hr Average bid
    $11 / hr 平均入札額
    32 入札

    Need an experienced s specialist to configure our SIP and PRI trunks I will provide remote access to the server and trunk credentials once we agree on the approach. Looking forward to working with someone who can get this running quickly and cleanly. Asterisk PBX Linux SIP Software Architecture,Engineering VoIP

    $230 Average bid
    $230 平均入札額
    10 入札
    UAE Business VoIP Number Needed
    1 日 left
    認証済み

    I need UAE number for VOIP call inbound and outbound call, do you know which provider is best for this ? or you can provide us this service ?

    $165 Average bid
    $165 平均入札額
    2 入札

    I need an experienced telephony engineer to bring up a new IVR on our Asterisk-based server that will answer calls coming in on both a SIP trunk and a PRI. The core requirement is a clean, dependable call-routing tree—callers should reach the right destination every time—with call recording and basic, built-in reporting turned on from day one. Environment • Linux box already running Asterisk (remote SSH available) • One SIP trunk + one PRI (credentials and circuit details ready) Scope of work 1. Configure the IVR in Asterisk, activate call routing options, and confirm that both trunks follow the same logic. 2. Enable call recording for all menu paths, store files locally in an organised directory structure, and verify playback. 3. Turn on the stock call‐...

    $260 Average bid
    $260 平均入札額
    5 入札
    Cold Callers for Web Dev Sales
    1 日 left
    認証済み

    I run a growing website-development agency and have compiled a database of cold leads—mainly owners of small businesses spread across several countries. Your mission is to pick up the phone, engage these prospects, and turn curiosity into signed development projects. You will receive: • A regularly updated spreadsheet of verified cold leads (names, phone numbers, business URLs, and brief notes). • A concise call script highlighting our core offers: custom WordPress sites, redesigns, and maintenance packages. • Login to our cloud CRM (HubSpot) to track each interaction. What I need from you: • Confident, fluent phone outreach during the prospects’ local business hours. • Accurate, same-day CRM updates—status, call notes, next steps. &...

    $137 Average bid
    $137 平均入札額
    24 入札
    Cold-Call Auto Leads & Appointments
    16 時間 left
    認証済み

    We are an Ontario-based automotive dealership and leasing company looking for a skilled Lead Generation & Appointment Setting Specialist. Your role will include both: Generating qualified leads Calling or email and texting incoming leads from existing source. Calling and booking appointments from inbound and outbound leads This is a long-term role for someone who can consistently deliver real buyer leads. Responsibilities Lead Generation Find potential customers actively looking for vehicles or leasing options through: Facebook Marketplace AutoTrader & CarGurus inquiries Local buy/sell groups Instagram or WhatsApp outreach Collect lead details: Name Phone number Vehicle interest Budget Location Lead Qualification & Calling Call leads using our Canadian VoIP ...

    $5 / hr Average bid
    $5 / hr 平均入札額
    21 入札

    We need a developer to build a real-time voice transformation application that changes our voice during live phone calls (both inbound and outbound) using the ElevenLabs Speech-to-Speech API. What We Need: The app should capture microphone input, stream it to the ElevenLabs voice changer API, and route the transformed audio back through a virtual audio device (like VB-Cable or VoiceMeeter) so it can be used as a microphone input for any calling app — Zoom, Google Voice, Teams, RingCentral, or any softphone. Key Requirements: Real-time voice transformation with minimal latency (target sub-500ms) Works with any phone/calling application via virtual audio device Supports both inbound and outbound calls Simple desktop GUI with voice selection, on/off toggle, and audio level meters Abil...

    $23 / hr Average bid
    $23 / hr 平均入札額
    111 入札

    I have a growing list of candidates who have already applied through our recruitment portal; now I need a personable caller to take the conversation further. Your task is simple but crucial: telephone each applicant and guide them through my pre-written 10-step questionnaire so we can capture deeper insight into their qualifications and experience. I will supply: • Daily call list with direct phone numbers and time-zone notes • The scripted questionnaire and answer key • A cloud sheet (Google Sheets / Excel 365) where you can log every response immediately after each call • Voip logins for calling with transcripts of the calls... so you wont need to make any data entry. What I need from you: • Professional, friendly phone manner and clear native English &bu...

    $17 / hr Average bid
    $17 / hr 平均入札額
    31 入札

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