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!

De 24,489 opiniones, los clientes califican nuestro VoIP Developers 4.82 de un total de 5 estrellas.
Contratar a 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!

De 24,489 opiniones, los clientes califican nuestro VoIP Developers 4.82 de un total de 5 estrellas.
Contratar a VoIP Developers

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    12 trabajos encontrados

    En nuestra correduría de seguros estamos migrando todo el flujo de voz a una PBX Yeastar P-Series (Appliance Edition) y necesito a un especialista —o empresa— que la ponga en marcha de forma llave en mano aquí en Caracas y luego brinde soporte continuo. Lo que quiero lograr • 16 usuarios iniciales del equipo comercial operando sobre la nueva central. • Gateways Yeastar GSM (serie TG) y FXO (serie TA) correctamente enlazados. • Grabación de llamadas siempre activa para auditoría de calidad. • Integración nativa con HubSpot CRM Enterprise: registro automático de llamadas, click-to-call e identificación inmediata de contactos. Lo que valoro • Experiencia avanzada con la serie P comprobable en insta...

    $361 Average bid
    $361 Oferta promedio
    13 ofertas

    Title: Real-Time Automotive Market Intelligence Engine, Split-Screen UI & Staggered Asterisk VoIP Auto-Dialer Description: NOTE: Start your proposal with the word "SNIPER" or you will be ignored instantly. I am looking for a top-tier full-stack developer / IT-security specialist to build a custom, highly sophisticated real-time automotive market intelligence engine. The platform must be fully containerized via Docker and deployed on my Linux VPS hosted in the Hetzner datacenter in Falkenstein, Germany. This system needs to compete with the speed and logic of premium commercial dealer applications, but serve as an exclusive, private web application optimized for desktop browser use with an integrated automated VoIP infrastructure. PROJECT ARCHITECTURE & DELIVERABLES (To...

    $2915 Average bid
    $2915 Oferta promedio
    28 ofertas
    CLI Provider Manager for FreePBX
    6 días left
    Verificado

    I manage a FreePBX-based platform and need to integrate a robust, fully command-line-based provider manager for domestic US call termination. The solution must allow me to: • Send local ANI traffic, toll-free (TFN) calls, and unrestricted wireless calls. • 100% CLI outbound calls. • Maintain call quality and availability at the level of the most popular retail carriers. The acceptance process will be simple: I will install your configuration on a test PBX, make and receive all three types of calls mentioned, and monitor stability for 24 hours. If everything works correctly, with caller ID displayed on screen and no audio issues, we will need 200 to 500 ports to use, and you will act as our intermediary. Please suggest and secure your preferred carrier; we only ask that t...

    $2080 Average bid
    $2080 Oferta promedio
    27 ofertas

    I’m rolling out a focused B2B outreach campaign and need a confident caller to turn cold contacts into booked meetings and closed deals. The sole metric that matters to me is the number of closed deals you add to my portfolio. You’ll be speaking with owners and decision-makers at small businesses. Typical calls will revolve around introducing our service, handling objections, and locking in a specific date and time for an online demo. A clear, well-maintained call log inside our CRM, brief call notes, and calendar invites for every accepted meeting make up the core deliverables. Ideal fit • You have demonstrable experience running B2B cold-calling or tele-sales campaigns. • You’re comfortable using a VoIP dialer and basic CRM tools (e.g., HubSpot, Zoho, Pipe...

    $10 / hr Average bid
    $10 / hr Oferta promedio
    8 ofertas

    I need a remote assistant who can confidently handle both phone and WhatsApp interactions in English. Most of the work revolves around customer support, specifically technical questions about our product line. You’ll be answering inbound calls, placing the occasional follow-up call when a ticket needs clarification, and replying to written WhatsApp queries in real time. Our in-house knowledge base, call scripts, and WhatsApp templates are ready for you; what I need is your clear, friendly voice, solid technical-troubleshooting mindset, and the discipline to document each interaction in our CRM before closing the ticket. Key things to know • The audience is English-speaking customers only. • All calls are customer-support in nature—no sales or appointment setting...

    $138 Average bid
    $138 Oferta promedio
    43 ofertas

    I need a new Kamailio setup primarily for VoIP call routing. This setup should support SIP and WebRTC protocols. Key Requirements: - Configure Kamailio for VoIP call routing - Support for SIP and WebRTC protocols - Detailed documentation of the setup Ideal Skills and Experience: - Expertise in Kamailio - Strong knowledge of VoIP, SIP, and WebRTC - Experience with system configuration and documentation

    $2017 Average bid
    $2017 Oferta promedio
    32 ofertas

    YOU MUST BE FROM THE PHILIPPINES TO APPLY! Pay is $4/hour. Only respond if you agree to this pay rate. I run a small U.S.-based operation that needs hands-on help with day-to-day customer interactions. From 12 p.m. to 5p.m. Eastern (that’s 12 a.m.–3 a.m. Manila time), I receive a steady flow of inbound calls and emails, plus occasional outbound follow-ups, and I want every contact handled promptly and professionally. During that three-hour window you will: • answer incoming calls and place quick outbound callbacks when required, • reply to customer emails in a friendly, concise tone, and • keep our live-chat widget active so no visitor waits more than a minute. A rock-solid, high-speed internet connection is essential—dropped calls or slow chat r...

    $6 / hr Average bid
    $6 / hr Oferta promedio
    25 ofertas
    Cold Calling VoIP Leads
    4 días left
    Verificado

    I’m launching a focused cold-calling push aimed at medium-sized enterprises to create qualified leads for our VoIP phone service. Your job is to pick up the phone, introduce the solution, and secure interest strong enough for a follow-up demo with our sales engineer. You’ll work from a concise script highlighting cost savings, reliability, and scalability of our cloud-based VoIP platform, yet you’re free to adapt your tone so the conversation feels natural. A starter list of target companies is ready; as calls progress I’ll rely on you to keep notes in the shared CRM and flag any data gaps you uncover so we can refine the list together. Deliverables I need from you • Daily call log with outcome codes (connected, voicemail, gatekeeper, etc.) • A sprea...

    $175 Average bid
    $175 Oferta promedio
    19 ofertas

    We are a healthcare organization in Saudi Arabia looking for an experienced consultant to review and improve our call center operations. Current issues include: * Missed calls * Abandoned calls * Queue performance problems * Ineffective call routing * Reporting and KPI visibility challenges We are prioritizing candidates with: - Healthcare call center experience in Saudi Arabia and the GCC region - Experience supporting Arabic-speaking environments - Expertise in PBX, queue management, call routing, and CRM integrations We are specifically seeking consultants who have diagnosed and improved real healthcare call center operations. General AI developers are not a focus for this role. Please provide examples of similar projects you have completed.

    $455 Average bid
    $455 Oferta promedio
    17 ofertas

    I'm looking for an experienced VoIP/SIP developer (or small team) to build a cross-platform SIP client supporting both peer-to-peer calls and video conference joining, with no mandatory registration (registration support required but optional at runtime). Core requirements: 1:1 P2P SIP calls without registration, plus ability to join video conferences regardless of the conferencing platform Audio + video with these codecs: Video — H.264, H.265; Audio — Opus, G.711, G.722, G.729 (G.729 if licensing permits) BFCP for screen sharing Participant list retrieval (including a proxy approach to read participants from the backend if needed) Optional SIP registration (built in for future use) Platforms: iOS, Android, Windows, macOS Preferred stacks: PJSIP or baresip — propose...

    $13881 Average bid
    $13881 Oferta promedio
    143 ofertas
    Configurar SIP Trunk no 3CX
    1 día left
    Verificado

    Tenho um PABX VoIP 3CX já instalado na versão 20. O SIP Trunk encontra-se ativo em uma linha dedicada baseada em IP e a conexão é uma ligação dedicada de alta velocidade. Eu conheço o processo em teoria, mas ainda não fiz essa configuração na prática. Preciso que você: • Crie o tronco SIP no 3CX, inserindo as credenciais fornecidas pelo meu provedor. • Ajuste codecs, autenticação e rotas de entrada/saída. • Teste chamadas internas, externas e DIDs para garantir qualidade de áudio e registro estável. • Documente cada etapa (prints ou texto breve) para que eu possa replicar ajustes futuros. O acesso remoto ao servidor 3CX e aos dados do provedor ...

    $22 Average bid
    $22 Oferta promedio
    13 ofertas

    Flutter Calling App (Customer Listener) Tech Stack Flutter Mobile App Node.js Backend ZEGOCLOUD Voice/Video Calling SDK Firebase Cloud Messaging (if implemented) Issue Description The app allows Customers to call Listeners using ZEGOCLOUD. The call works when both users are actively using the app. However, when the Listener app is in the background or the device is locked, incoming calls are not being received consistently. Expected Behaviour Listener receives incoming call when app is open. Listener receives incoming call when app is minimized. Listener receives incoming call when phone screen is locked. Listener can accept/reject directly from incoming call screen. Call notifications should work reliably on Android and iOS. Areas to Investigate Flutter Side Zego Call Invitation Service i...

    $16 Average bid
    $16 Oferta promedio
    16 ofertas

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