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 30,934 reviews, clients rate our VoIP Developers 4.89 out of 5 stars.
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    22 jobs found, pricing in USD

    I'm seeking a skilled network expert to assist with setting up a GRE tunnel on our MikroTik router. The primary goal of this project is to seamlessly connect our multiple remote offices. Key Requirements: - Implementation of a MikroTik GRE tunnel configuration emphasizing on traffic routing - Ensuring optimal connectivity and data transmission between all connected offices Ideal Candidate: - Proficiency in MikroTik router configuration, particularly with GRE tunnels - Solid understanding and experience with network traffic routing - Prior experience with setting up connectivity for remote offices - Ability to ensure uninterrupted data transmission and network availability across multiple locations This is an urgent project, so I'm looking for someone who can start promptly an...

    $19 / hr (Avg Bid)
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    6 bids

    I am looking for a competent professional with experience in Freepbx and Avaya IP integration. The primary objectives of the project are call routing, call forwarding, and establishing a unified voicemail. What I am looking for: - Experience with Freepbx and Avaya IP office 500 V2 systems - Proven track record with telecommunication technology - Capability to integrate functionalities even with gaps in specific call routing or forwarding options Please note that while some specifics on the call routing and forwarding options are not outlined, I expect freelancers to provide suggestions based on their experience and expertise. I look forward to working with an individual who can make these systems work smoothly together.

    $108 (Avg Bid)
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    10 bids

    As a client looking to set up a home VoIP solution, I'm seeking guidance from a skilled freelancer experienced with both Raspberry Pi and Asterisk server setup. Key Project Details: - I do not require a full-fledged PBX setup, just a basic VoIP service facilitated through my Raspberry Pi. - The primary feature I'm interested in implementing is voice calling. Required Skills: - Proficiency in configuring an Asterisk server on Raspberry Pi. - Strong understanding of VoIP and related protocols. - Ability to guide and explain the setup process clearly. Your Role: I've tried to set it up but no voice can be heard on the other end. So this task is mainly a trouble shooting job. Your primary role will be to walk me through the setup of Asterisk on my Raspberry Pi, ensuring prop...

    $86 (Avg Bid)
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    11 bids

    I'm seeking a skilled professional for the setup of a WebDialer recording system to handle both inbound and outbound calls. The primary purpose of this system is for quality assurance, training, and compliance monitoring purposes. Experience in integrating with Customer Relationship Management systems (CRMs) is a must. Preferred Qualifications: - Familiarity with call recording systems - Proven ability in the setup of WebDialer systems - Ability to integrate systems with a CRM - Strong knowledge of compliance monitoring - Proven record in quality assurance Remember, the successful implementation of this project will ultimately help improve our services, aid in employee training, and ensure compliance with relevant regulations. Your expertise will go a long way towards achieving th...

    $115 (Avg Bid)
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    I'm seeking a versatile call agent capable of juggling several tasks. Your daily responsibilities will span from answering inquiries to making outbound calls and taking sales orders. You’ll be primarily dealing with both business and individual customers - hence, excellent communication skills are a must. All-rounders who can handle product details, order status, and customer complaints proficiently will be an ideal fit. This job requires a keen eye for detail, sales and customer service expertise; multitasking proficiency is a must. Previous call center experience will be an advantage.

    $783 (Avg Bid)
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    26 bids
    Customer Service Agent Needed 5 days left
    VERIFIED

    I'm seeking a versatile call agent capable of juggling several tasks. Your daily responsibilities will span from answering inquiries to making outbound calls and taking sales orders. You’ll be primarily dealing with both business and individual customers - hence, excellent communication skills are a must. All-rounders who can handle product details, order status, and customer complaints proficiently will be an ideal fit. This job requires a keen eye for detail, sales and customer service expertise; multitasking proficiency is a must. Previous call center experience will be an advantage.

    $384 (Avg Bid)
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    21 bids

    I require an expert in Asterisk and FreeSWITCH development, along with experienced system engineering skills. Specifically, I need help with: - Asterisk and FreeSWITCH development - Integrating VoIP - Setting up Call routing and IVR (Interactive Voice Response) - CTI - Skill group base call routing to agents. Apart from these, the implementation of Asterisk and FreeSWITCH clustering as well as Call Center Reporting is required. The technology stack should be Linux, PHP, MySQL along with postgresql and API knowledge. The freelancer should have considerable experience in these to meet the project's specific requirements.

    $14528 (Avg Bid)
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    29 bids

    I'm looking for an experienced freelancer to help me set up the SIP locally to connect incoming calls to an AI script I have. This setup has to be done on VICIdial using the QuestBlue SIP. The main objective of this project is to establish a call response system. As someone with a pre-built AI script, I need you to link it to the incoming calls on the VICIdial platform. Your expertise will include, but not be limited to: - Proficiency in VICIdial: You must have previous experience working with this platform. - Familiarity with SIP set-ups: QuestBlue SIP experience would also be a bonus. - AI Integration: Able to connect incoming calls to an AI script. Please ensure these skills align with your capabilities before bidding on this project.

    $158 (Avg Bid)
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    33 bids

    I currently have enhanced licenses for Cisco CUCM 11.5 and I'm seeking to upgrade to the Flex system within a month. While I've skipped explaining the specific functionalities I'm looking to add with the Flex system, ideally, the prospective freelancer should be well-experienced in transitioning from Cisco CUCM's enhanced licenses to Flex. Desired Skills and Experience: - Proficiency in Cisco CUCM 11.5 licensing and operations - Experience in upgrading to Flex system - Strong understanding of Flex system functionality options - Ability to recommend suite of functionalities to maximize collaboration, mobility and contact center features. - Ability to deliver the project within a month time frame.

    $582 (Avg Bid)
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    Se requiere una persona con experiencia configurando la libreria de Javascript SIPML5 y asterisk. Tenemos todo instalado y configurado. El softphone web se registra al asterisk, emite y recibe llamadas, pero cuando se atiende la llamada no transmite el audio. El servidor tiene instalado una VPN. Cuando el usuario se conecta a la VPN, entonces funciona el audio de la comunicación pero cuando no se conecta a la VPN entonces vuelve el problema del audio. Se requiere que el softphone funcione sin VPN, solo por internet. Version asterisk 18 OS: Ubuntu Server 14 +++++++++++ A person with experience configuring the SIPML5 and Asterisk Javascript library is required. We have everything installed and configured. The web softphone registers to Asterisk, sends and receives calls, but when th...

    $37 / hr (Avg Bid)
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    27 bids

    I'm in need of a skilled developer or a company that can provide me with a comprehensive voice solution for user verification and authentication. The project will involve two main components: a call voice blasting solution and a standalone voice OTP service integrated into my system. Key Project Requirements: - **User Verification and Authentication**: The primary purpose of this project is to ensure secure user verification and authentication. - **Call Voice Blasting Solution**: I require a highly customized solution for call voice blasting. It should cater to the specific needs of our user base. - **Voice OTP Service**: I need a standalone application that can provide a seamless OTP service. This application should be integrated into my existing system. Ideal Skills and Experienc...

    $159 (Avg Bid)
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    I am in search of a skilled IT Administrator with expert-level proficiency in Vici Dialer. The ideal candidate will be able to manage, configure, troubleshoot, and provide support for the system. Key Responsibilities: - Setting up and configuring the Vici Dialer system - Diagnosing and resolving technical issues - Providing ongoing support and maintenance to ensure the system's smooth operation The IT Admin should have a deep understanding of the Vici Dialer system and its functionalities, and should be able to proactively address potential issues before they impact our operations. Experience in a similar role is essential. Looking for someone who is: - A Vici Dialer expert - Proactive and solution-oriented - Experienced in IT administration - Excellent in communication and proble...

    $121 (Avg Bid)
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    8 bids

    I'm in need of an expert who can help install and set up an Alcatel PBX system for a medium-sized enterprise. The project also involves integrating this PBX system with VoIP services. This will be remote project, our team will give you access from the site. Key Responsibilities: - Configuration of Alcatel PBX system OXO408 - Integration of the PBX system with VoIP services along with call recording. - Integration with existing Cisco IP Telephony Ideal skills for this job include: - Profound understanding of Alcatel PBX systems. - Experience with VoIP services integration. - Prior work on medium-sized enterprise deployments. Your expertise in these areas will help us to establish a reliable communication system for our business, ensuring seamless connection with our clients and wi...

    $148 (Avg Bid)
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    5 bids

    I'm seeking someone to handle incoming calls and text messages for my business and schedule appointments. Key Responsibilities: - Answering incoming calls during business hours (9am-6pm) - Collecting essential information from callers, including their name, phone number, the service they're interested in, and their preferred date and time for an appointment Ideal Skills and Qualities: - Excellent communication skills and phone etiquette - Organized and detail-oriented - Previous experience in customer service or appointment scheduling would be advantageous. The successful candidate should be able to manage calls professionally and efficiently, ensuring that all relevant information is gathered accurately and appointments are scheduled in line with our availability.

    $5 / hr (Avg Bid)
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    I need a virtual Indian mobile number service that comes with key features like call forwarding, SMS forwarding, and voicemail. The critical functionality this service should have is call-based OTP verification. This OTP verification should be facilitated by an automated voice message that will provide users with the OTP. While there hasn't been a need for additional features such as an OTP recall option, multilingual support or a customizable message template, I would definitely prioritize a service that delivers on prompt and seamless OTP verification. Freelancers with prior experience developing or integrating similar services will have a distinct advantage. Crucial skills for this project include experience with VoIP services, OTP systems and automation. Understanding of India...

    $24 (Avg Bid)
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    8 bids

    Ongoing weekly work opportunity up to 60 hours per week I'm looking for a dedicated professional who can serve as the primary point of contact for my company, overseeing both customer support and team coordination. More specifically, I need someone who can assist in setting up a system that will: - Enable VoIP calling capabilities: You'll be responsible for setting up a system that can make calls to my customers from your country, but display an Australian number. - Schedule and Calendar Integration: You'll be in charge of setting daily schedules for teams, ensuring everyone's tasks are balanced. - You will be required to answer phone calls send text messages to team and customers for up to 50 hours per week. - you will need to be the point of contact for all team or...

    $157 (Avg Bid)
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    28 bids

    I'm in need of a seasoned salesperson with expertise in telecommunications sales, excellent interpersonal skills, and a solid understanding of VoIP systems, to drive sales of our secure landline VoIP phone system to United States small and medium businesses. Key responsibilities include: - Inside and outside sales activities to potential small business customers - Conducting engaging remote and on-site product demonstrations - Handling objections and closing the sale The ideal candidate should have: - Prior experience and a successful sales track record in the telecommunications and/or cybersecurity industry - Exceptional communication and negotiation skills - A solid understanding of landline phone systems Your role will be pivotal in boosting sales and our presence in the small b...

    $148 (Avg Bid)
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    14 bids

    I'm in urgent need of a talented developer with significant experience in integrating multiple Twilio features into websites. This project includes: 1. **SMS Messaging:** Incorporation of Twilio's SMS messaging feature into the website for automated notifications and communication processes. 2. **VOIP Calling:** The website needs in-built VOIP calling capabilities, ideally, using Twilio's services. 3. **Video Conferencing:** We also need effective implementation of Twilio's video conferencing service on the website to allow online meetings and webinars. While the website's build platform is proprietary and not aligned with any typical frameworks, the successful candidate should exhibit versatility in dealing with various platforms and have expertise to quickly gr...

    $150 (Avg Bid)
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    I need an expert in networking, VOIP, and server administration to handle various ongoing tasks in our data centers. Key Tasks: - Network Configuration: You'll be responsible for setting up and maintaining our network infrastructure. - Troubleshooting: Whenever there are network, VOIP or server issues, you should be able to troubleshoot and resolve them efficiently. - VOIP Engineering and Troubleshooting: You'll be responsible for improving our quality and security around our VOIP services in our data centers and customer sites as well as troubleshooting VOIP issues. Your Responsibilities: - Engage in network configuration and maintenance, ensuring optimal performance. - Efficiently troubleshoot network, VOIP and server issues as they arise. - Implement VOIP solutions as part ...

    $214 (Avg Bid)
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    SRP Consulting -- 6 23 hours left
    VERIFIED

    We are looking for consultants - Consultant preferred from India. 1) Consultant - SRP Experience in working with development/implementation of SCP and SRF. Experience in handling interfaces of SCP SRF like INAP, SIP, Webservices, Websockets WebRTC (in the context of SCF and SRF) ISUP over SS7 Experience in Dialogic API for SS7 and INAP Experience in using JSS7 API from RestComm or it's variant of Mobius JSS7 or any of the varient IVR implementation with Freeswitch on SS7 Knowledge and work experience on YATE SS7 implementation. Anyone with following expereince and skills also may apply Consultant - CRBT worked in CRBT and similar products Having knowledge in the following protocols a) INAP over SIGTRAN/SIP b) SIP/RTP c) ISUP over E1 3) M3UA over SIGTRAN Knowledge on working with Fr...

    $297 (Avg Bid)
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    3 bids

    We're in need of an IT consultant who has a solid background in working with Verizon tech support. Our 15-year-old business mobile number has been experiencing accessibility issues and we are looking to "re-secure" it so that we can port it to a VOIP service for more advanced features and services. Key Requirements: - Experience with Verizon tech support: Ideally, the freelancer should have hands-on experience in dealing with Verizon tech support, particularly in the context of mobile number security issues. - Knowledge of VOIP services and porting: Understanding of how VOIP services work and experience in porting numbers is a must. - Proven track record in IT consultancy: The ideal candidate should have a proven track record in IT consultancy, particularly in the cont...

    $588 (Avg Bid)
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    Estamos à procura de um especialista em Issabel e Asterisk para implementar um sistema de Resposta Vocal Interativa (IVR) na nossa plataforma de servidor Issabel 4.0.0-6. O objetivo deste sistema é realizar entrevistas telefónicas automatizadas onde os respondentes possam responder a perguntas pré-gravadas utilizando o teclado do seu telefone. O sistema deve ser capaz de carregar uma base de contactos para realizar automaticamente as chamadas telefónicas e capturar estas respostas numa base de dados para análise subsequente. Além disso, o sistema IVR deve incluir a funcionalidade de conversão de texto em voz (TTS) para facilitar a criação e atualização de prompts de voz. No entanto, também deve ser...

    $583 (Avg Bid)
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    3 bids

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