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 33,152 reviews, clients rate our VoIP Developers 4.9 out of 5 stars.
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    13 jobs found, pricing in USD

    We have setup a server on premises we would like to install Cisco phones 7962 with sccp

    $26 (Avg Bid)
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    7 bids

    I'm in need of an experienced Vicidial engineer to troubleshoot performance and config issues with my current system. I need someone experienced with CID rotation and monitoring for caller ID reputation, DID groupings and assignments, campaign refinement (list evolution) etc. Also need someone with the ability to look at carrier codes to troubleshoot answer rate (call pickup) variations. Looking for now, thanks!

    $33 / hr (Avg Bid)
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    45 bids

    I'm in need of a call center to help generate sales and customer service leads. The ideal candidate will be able to: - Conduct outbound sales calls to generate interested leads - Provide customer service to current clients as needed - Adjust their strategy to generate less than 50 leads per week The process of lead generation can be vital for the growth of a business, so your ability to provide quality is crucial. Experience in telesales, customer service and lead generation is a big plus.

    $91 (Avg Bid)
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    7 bids

    I require a bilingual (English and Spanish) phone call answer agent who can handle both inbound and outbound calls. This is a time-sensitive project, so I need someone who can start immediately and work efficiently to provide excellent customer service and resolve issues as they arise. Ideal Skills and Qualifications: - Fluency in both English and Spanish is non-negotiable - you should be able to handle calls in both languages - Previous experience in customer service or call center environment will be an advantage - Excellent communication skills are key - A positive attitude and the ability to handle high-pressure situations are crucial - Efficient problem-solving skills are a must - Strong work ethic and ability to work independently - Experience in handling a high volume of calls woul...

    $440 (Avg Bid)
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    10 bids

    I'm seeking a skilled VoIP engineer who can boost the concurrent call capacity of our existing Asterisk server using OpenSIPS. Specifications: - The primary goal is to enhance the concurrent call capacity of our Asterisk server, making it more scalable and efficient. Key Responsibilities: - Implementation of an OpenSIPS SIP proxy that can effectively distribute SIP traffic across multiple Asterisk servers. - Ensure the SIP proxy is configured to handle a high volume of calls simultaneously. Ideal Skills: - Strong experience with VoIP technologies, particularly Asterisk and OpenSIPS. - Proven track record of optimizing call capacity on telephony platforms. - Familiarity with architecture design for scalable and redundant systems. This project offers a great opportunity to demonstra...

    $581 (Avg Bid)
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    5 bids

    I'm seeking a skilled VoIP engineer who can boost the concurrent call capacity of our existing Asterisk server using OpenSIPS. Specifications: - The primary goal is to enhance the concurrent call capacity of our Asterisk server, making it more scalable and efficient. Key Responsibilities: - Implementation of an OpenSIPS SIP proxy that can effectively distribute SIP traffic across multiple Asterisk servers. - Ensure the SIP proxy is configured to handle a high volume of calls simultaneously. Ideal Skills: - Strong experience with VoIP technologies, particularly Asterisk and OpenSIPS. - Proven track record of optimizing call capacity on telephony platforms. - Familiarity with architecture design for scalable and redundant systems. This project offers a great opportunity to demonstra...

    $389 (Avg Bid)
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    3 bids

    I am looking to set up a PowerMTA server with integrated MailWizz, focusing on bulk marketing email delivery. Beyond set up, comprehensive documentation explaining procedure in a simple-to-understand way is key to enable future self-service. Requirements include: - PowerMTA installation and set up on my Linode server - MailWizz integration with PowerMTA - Documentations on setup procedures and email delivery management/actions - Expertise in bulk email marketing deployment validate all dns records Configuration: After installation, you need to configure PowerMTA according to your requirements. This includes setting up IP addresses, domains, authentication mechanisms (like SPF, DKIM, and DMARC), bounce processing, and other delivery settings. This step often involves editing the conf...

    $134 (Avg Bid)
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    5 bids

    I am looking to set up a PowerMTA server with integrated MailWizz, focusing on bulk marketing email delivery. Beyond set up, comprehensive documentation explaining procedure in a simple-to-understand way is key to enable future self-service. Requirements include: - PowerMTA installation and set up on my Linode server - MailWizz integration with PowerMTA - Documentations on setup procedures and email delivery management/actions - Expertise in bulk email marketing deployment validate all dns records Configuration: After installation, you need to configure PowerMTA according to your requirements. This includes setting up IP addresses, domains, authentication mechanisms (like SPF, DKIM, and DMARC), bounce processing, and other delivery settings. This step often involves editing the conf...

    $26 (Avg Bid)
    $26 Avg Bid
    6 bids

    Follow this code: I urgently need a professional who can help me set up and integrate Twilio's calling functionalities with an IVR system, using Elevenlabs and ChatGPT. Key Requirements: - Implement an Interactive Voice Response (IVR) system with Voice Recognition - Enable Call Recording feature Additional Details: - The IVR system should be voice recognition-based, guiding callers through the menu without the need for DTMF input - The integration between Twilio, Elevenlabs, and ChatGPT must be smooth and seamless - The project has an urgent deadline, so time is of the essence Ideal Skills: - Proficiency in Twilio's calling functionalities and APIs - Experience in setting up IVR systems, particularly with voice recognition - Familiarity with Elevenlabs and ChatGPT is a plu...

    $147 (Avg Bid)
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    61 bids

    I urgently need a professional who can help me set up and integrate Twilio's calling functionalities with an IVR system, using Elevenlabs and ChatGPT. Key Requirements: - Implement an Interactive Voice Response (IVR) system with Voice Recognition - Enable Call Recording feature Additional Details: - The IVR system should be voice recognition-based, guiding callers through the menu without the need for DTMF input - The integration between Twilio, Elevenlabs, and ChatGPT must be smooth and seamless - The project has an urgent deadline, so time is of the essence Ideal Skills: - Proficiency in Twilio's calling functionalities and APIs - Experience in setting up IVR systems, particularly with voice recognition - Familiarity with Elevenlabs and ChatGPT is a plus - Ability to meet ...

    $222 (Avg Bid)
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    24 bids

    I'm looking to develop an app that can handle calls and messages across different platforms like iOS and Android. Key Features: - Call Handling: The app should be able to manage incoming calls effectively, helping me prioritize and manage them efficiently. - Message Handling: I would like to be able to send and receive messages seamlessly across platforms. - Cross-Platform Compatibility: The app should work smoothly on both iOS and Android devices. Additional Features: - Push Notifications: I'm interested in having push notifications for incoming calls and messages. - Call Recording: It would be great if the app can record calls for future reference. - Contact Synchronization: I need the app to sync my contacts across different platforms. I'm seeking a developer with a g...

    $1335 (Avg Bid)
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    80 bids

    As a business, we're in need of an experienced professional to work on configuring our Cisco router and establish a site-to-site VPN. You will be responsible for: - Configuring the router to enable VPN - Setting up a secure site-to-site VPN for remote access Already in place is all the required infrastructure, so we expect smooth, quick, and hassle-free setup with minimal downtime. Ideal skills include: - Expertise with Cisco systems - In-depth knowledge and experience in VPN Setup and maintenance - Understanding of network security protocols This job requires someone who can deliver efficient, effective solutions, ensuring secure, remote access for our team. Your proficiency in keeping our systems up and running will enable our business to operate seamlessly, regardless of ...

    $106 (Avg Bid)
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    22 bids

    Actualmente estoy en la fase de desarrollo de un sistema de Call Center personalizado y necesito un desarrollador de Asterisk para desarrolar nuevo sistema desde cero - El sistema se debe crear desde cero. - Las funcionalidades específicas que se implementarán o mejorarán incluyen la integración con API para sistema de cobros, automatización de llamadas e informes y análisis de datos en tiempo real. - En cuanto a la integración de APIREST de Redsys, se espera que el sistema sincronice bbdd con los pagos que se hagan de datos de clientes, registre compras automáticamente y proporcione capacidades de seguimiento. El candidato ideal debería tener: - Amplia experiencia con Asterisk y sistemas similares. - Trabajo previo en solucio...

    $2295 (Avg Bid)
    $2295 Avg Bid
    49 bids

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