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 24,384 รีวิว ลูกค้าให้คะแนน VoIP Developers 4.8 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 24,384 รีวิว ลูกค้าให้คะแนน VoIP Developers 4.8 จาก 5 ดาว
จ้าง VoIP Developers

ตัวกรอง

การค้นหาล่าสุดของฉัน
คัดกรองโดย:
งบประมาณ
ถึง
ถึง
ถึง
ประเภท
ทักษะ
ภาษา
    สถานะงาน
    31 งานที่พบ
    Two-Way Call Connectivity Test
    6 วัน left
    ยืนยันแล้ว

    ** 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 การประมูลเฉลี่ย
    12 คำเสนอราคา

    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 การประมูลเฉลี่ย
    39 คำเสนอราคา
    Ubuntu Airtel SIP Initial Setup
    6 วัน left
    ยืนยันแล้ว

    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). •...

    $33 Average bid
    $33 การประมูลเฉลี่ย
    1 คำเสนอราคา

    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 ...

    $146 Average bid
    $146 การประมูลเฉลี่ย
    3 คำเสนอราคา

    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 การประมูลเฉลี่ย
    9 คำเสนอราคา
    Enable Panasonic SIP on FortiGate -- 2
    5 วัน left
    ยืนยันแล้ว

    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 การประมูลเฉลี่ย
    21 คำเสนอราคา

    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...

    $9 Average bid
    $9 การประมูลเฉลี่ย
    5 คำเสนอราคา

    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...

    $505 Average bid
    $505 การประมูลเฉลี่ย
    21 คำเสนอราคา

    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 การประมูลเฉลี่ย
    93 คำเสนอราคา

    I’m looking for help securing one United States VoIP DID that plugs straight into my existing PBX so our support team can start taking customer calls right away. The number must be fully functional for both inbound and outbound traffic and delivered with clear SIP credentials I can drop into my system without extra hardware. You’ll handle everything—from sourcing a reliable carrier, activating the line, and confirming it registers cleanly on my PBX—to ensuring call quality meets normal business-class standards. If you can bundle extras such as voicemail, call recording, or simple forwarding rules, let me know; they aren’t mandatory but would be appreciated. Once the line shows registered and I can place and receive live test calls, the job is done.

    $16 Average bid
    $16 การประมูลเฉลี่ย
    9 คำเสนอราคา

    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

    $69 Average bid
    พื้นที่
    $69 การประมูลเฉลี่ย
    2 คำเสนอราคา
    Change VICIdial Agent UI to this one
    4 วัน left
    ยืนยันแล้ว

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

    $27 / hr Average bid
    $27 / hr การประมูลเฉลี่ย
    8 คำเสนอราคา

    I need my new JustCall workspace created and ready to call today. The job is straightforward: register a fresh JustCall account under the details I’ll provide, secure a brand-new U.S. number, and confirm that both inbound and outbound calls work. You’ll handle the entire sign-up flow, any required ID or billing verification, and the quick configuration steps so I can log in and start dialing immediately—no number porting involved, just a clean setup. Deliverables • Active JustCall account in my name • New U.S. phone number attached and tested • One-page hand-off note showing where to adjust voicemail, business hours, and call-forward settings, plus proof that calls connect Experience with JustCall’s U.S. provisioning is essential since I’...

    $13 Average bid
    $13 การประมูลเฉลี่ย
    5 คำเสนอราคา
    Microsoft Teams Calling Setup
    4 วัน left
    ยืนยันแล้ว

    I’m unable to activate Microsoft Teams voice services from my current region, so I’m looking for someone who can quickly get a Teams account up and running with outbound calling to Europe. The account will be used strictly for voice—no file storage, messaging, or other workloads—so the focus is on provisioning the right license, enabling the Phone System add-on, assigning a number, and verifying that calls to European landlines and mobiles complete successfully. The account should have a business phone plan. What matters the most is that, once you’re done, I can sign in from my own desktop and mobile Teams apps, dial any European number, and experience clear audio. Deliverables: • A working Microsoft Teams tenant with voice calling enabled • One ...

    $242 Average bid
    $242 การประมูลเฉลี่ย
    26 คำเสนอราคา
    Daily ViciDial Voip Admin Support -- 2
    4 วัน left
    ยืนยันแล้ว

    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 การประมูลเฉลี่ย
    10 คำเสนอราคา

    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 การประมูลเฉลี่ย
    11 คำเสนอราคา

    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...

    $752 Average bid
    $752 การประมูลเฉลี่ย
    15 คำเสนอราคา

    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 การประมูลเฉลี่ย
    28 คำเสนอราคา

    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

    $226 Average bid
    $226 การประมูลเฉลี่ย
    9 คำเสนอราคา
    UAE Business VoIP Number Needed
    2 วัน left
    ยืนยันแล้ว

    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 การประมูลเฉลี่ย
    2 คำเสนอราคา

    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‐...

    $250 Average bid
    $250 การประมูลเฉลี่ย
    3 คำเสนอราคา
    Cold Callers for Web Dev Sales
    2 วัน left
    ยืนยันแล้ว

    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 การประมูลเฉลี่ย
    24 คำเสนอราคา
    Cold-Call Auto Leads & Appointments
    2 วัน left
    ยืนยันแล้ว

    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 การประมูลเฉลี่ย
    21 คำเสนอราคา

    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 การประมูลเฉลี่ย
    116 คำเสนอราคา

    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 การประมูลเฉลี่ย
    31 คำเสนอราคา
    AV Sound System Setup
    1 วัน left
    ยืนยันแล้ว

    I'm looking for an experienced AV installer to set up a sound system in my Pilates/Lagree reformer studio. The system should include microphone integration and six pendant speakers, and be compatible with headsets. It needs to be hardwired with an auto interface. Requirements: - Professional installation of sound systems - Experience with microphone integration - Knowledge of pendant speaker setup - Ability to ensure headset compatibility - Hardwired system installation Ideal skills include AV installation, technical knowledge of sound systems, and previous experience in fitness studio setups. Please provide examples of similar work.

    $2677 Average bid
    พื้นที่
    $2677 การประมูลเฉลี่ย
    3 คำเสนอราคา
    Node.js AI Voice Translation Center
    1 วัน left
    ยืนยันแล้ว

    PROJECT DESCRIPTION Context I'm looking for an experienced developer to build an intelligent call center system with automatic real-time voice translation. The project aims to enable agents in India (English speakers) to receive and handle calls from French customers, with instant bidirectional translation. Objective Create a complete solution that enables: Receiving incoming calls on a French number (OVH Telecom) Real-time voice translation French ↔ English/Hindi Automatic transfer to agent Latency < 1 second GDPR compliant (EU region) REQUIRED TECH STACK Backend Node.js (v20+) for HTTP server WebSocket (ws) for real-time audio streaming PM2 for process management APIs & Services OVH Telecom: VoIP telephony (REST API) Deepgram Nova-2: Speech-to-Text (French & E...

    $1740 Average bid
    $1740 การประมูลเฉลี่ย
    46 คำเสนอราคา
    ASTPP Rates & Prefix Setup
    1 วัน left
    ยืนยันแล้ว

    I need an expert to help me configure billing rates and internal prefixes in my ASTPP installation. Tasks: Import and set up billing rate cards. Configure internal prefixes for specific routing rules. Ensure the billing engine is capturing data correctly. This is a straightforward task for someone who knows ASTPP well. Please bid only if you have worked with ASTPP before and can start immediately.

    $26 Average bid
    $26 การประมูลเฉลี่ย
    28 คำเสนอราคา
    Conduct Applicant Follow-Up Calls
    20 ชั่วโมง left

    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...

    $2588 Average bid
    $2588 การประมูลเฉลี่ย
    38 คำเสนอราคา

    Hiring Full Stack Developer / Agency for AI-Powered White Label Loan SaaS Platform We are building a complete AI-enabled fintech loan platform with white label SaaS model, automation, CRM, and tracking system. Looking for an experienced developer or team to build the full product end-to-end. User Mobile App (Android & iOS) • Secure OTP login & consent flows • Personal Loan enquiry • Free CIBIL check + paid CIBIL repair consultation • EMI Calculator & Debt Consolidation • AI Chat Loan Assistant (Groq API) • Payment gateway integration • Multi-language ready Website (Same as App) • All loan modules • AI chat • Lead sync with CRM • UTM tracking support AI Chat System • Smart user qualification • Auto lead cr...

    $2548 Average bid
    $2548 การประมูลเฉลี่ย
    81 คำเสนอราคา
    Cold Caller / Appointment Setter – Roofing Only (Overseas Freelancers) -- 2
    4 ชั่วโมง left
    ยืนยันแล้ว

    Cold Caller / Appointment Setter – Roofing Only (Overseas Freelancers) We are a U.S.-based roofing company hiring experienced overseas cold callers to set roof inspection appointments for homeowners with verified storm damage. Roofing only. No solar. No other home services. ⸻ Who This Is For • Freelancers outside the U.S. • Fluent English required • Spanish is a strong plus • Proven cold-calling AND appointment-setting experience is REQUIRED • Home services experience preferred (roofing strongly preferred) ⸻ Job Overview You will be calling homeowners from storm-damage addresses pulled from Doorknocker. Roof damage has already been identified from the street, making these qualified cold calls — not random dialing. Addresses will be provided...

    $266 Average bid
    $266 การประมูลเฉลี่ย
    72 คำเสนอราคา

    บทความแนะนำสำหรับคุณโดยเฉพาะ