Internet Telephony


Internet Telephony, also known as Voice over Internet Protocol (VoIP), refers to the transmission of voice and multimedia data through the internet. It converts analog audio signals, like voice calls, into digital data packets which can be sent over the internet or IP-based networks. This technology enables cost-efficient communication and reduces reliance on traditional telephone systems.


The phonetic pronunciation of “Internet Telephony” is:- Internet: /ˈɪntərˌnɛt/- Telephony: /təˈlɛfəni/In the International Phonetic Alphabet (IPA), it would look like this: /ˈɪntərˌnɛt təˈlɛfəni/

Key Takeaways

  1. Internet Telephony enables voice communication over the internet, reducing communication costs and offering enhanced features compared to traditional phone services.
  2. VoIP, or Voice over Internet Protocol, is the most common technology used in Internet Telephony, allowing users to make calls using a broadband internet connection rather than a traditional phone line.
  3. Some benefits of Internet Telephony include lower call costs, better call quality and additional features such as video calling, messaging, and call forwarding, making it a popular choice for both personal and business users.


Internet Telephony is important because it revolutionizes the way people communicate by using the internet as a medium for voice and multimedia transmissions.

This technology offers greater flexibility, affordability, and accessibility compared to traditional telephony systems.

With Internet Telephony, individuals and businesses can make long-distance and international calls at significantly reduced costs, enabling them to connect with others seamlessly without worrying about geographic limitations or exorbitant charges.

Additionally, Internet Telephony supports advanced communication features like video conferencing, file sharing, and instant messaging which cater to the modern needs of an increasingly interconnected world, fostering global collaboration and teamwork.

Overall, the importance of Internet Telephony lies in its ability to transform communication methods and support the rapid exchange of information and ideas across vast distances at minimal expense.


Internet Telephony, also known as Voice over Internet Protocol (VoIP), has revolutionized the way we communicate by allowing voice and multimedia transmissions over the internet. The main purpose of this technology is to provide individuals and businesses with a cost-effective and efficient communication platform that takes advantage of the existing internet infrastructure. By converting voice signals into digital data packets, VoIP enables real-time communication across the globe without the need for traditional telephone lines or costly long-distance charges.

In addition to voice calls, users can also enjoy video calls, instant messaging, and other advanced features that enhance the overall communication experience. The applications for Internet Telephony extend beyond personal use, as businesses of all sizes have embraced VoIP technology for its numerous benefits. One of the primary uses for VoIP is within call centers, which often employ remote agents and handle large volumes of international calls.

By employing VoIP, businesses can significantly reduce their telecommunication expenses while maintaining high-quality connections. Moreover, the scalability and versatility of Internet Telephony enable businesses to integrate their communication systems with other office applications, such as Customer Relation Management (CRM) software, to improve productivity and streamline workflow processes. With continued advancements and increased accessibility, Internet Telephony has become an indispensable tool for modern-day communication, bringing people closer together than ever before.

Examples of Internet Telephony

Voice over Internet Protocol (VoIP) Services: VoIP is a technology that enables users to make and receive phone calls using their internet connection instead of traditional phone lines. Examples of popular VoIP service providers include Skype, Vonage, and RingCentral. These services allow users to make voice and video calls, as well as send instant messages and share documents, making communication easier and often more cost-effective.

Mobile VoIP Applications: There are several smartphone applications that utilize internet telephony to facilitate voice and video calls, bypassing traditional phone networks. Examples of such applications include WhatsApp, Viber, and Facebook Messenger. These apps leverage your mobile data or Wi-Fi connection to enable communication with other users, often providing additional features such as group messaging, location sharing, and multimedia support.

Virtual Phone Systems: Internet telephony has also paved the way for virtual phone systems, benefiting businesses by simplifying their communication infrastructure and reducing costs. Examples of these systems include Grasshopper, 8×8, and Google Voice. These services provide businesses with features like call forwarding, call routing, voicemail, and conferencing using internet connections, removing the need for expensive and cumbersome hardware.

Internet Telephony FAQ

What is Internet Telephony?

Internet Telephony, also known as Voice over Internet Protocol (VoIP), is a technology that allows users to make voice and video calls using a broadband internet connection instead of a traditional phone line. This technology converts voice signals into digital packets and transmits them over the internet, enabling users to communicate with others worldwide at a lower cost.

How does Internet Telephony work?

Internet Telephony uses a combination of hardware and software to convert analog voice signals into digital data packets, which are then transmitted over the internet. This process typically involves an IP phone, a softphone, or an analog telephone adapter (ATA) connected to a user’s computer or internet-enabled device. The data packets are sent to their destination, where they are reassembled and converted back into an audible voice signal for the recipient.

What are the benefits of using Internet Telephony?

Some benefits of using Internet Telephony include:

  • Reduced costs: VoIP services typically cost less than traditional phone services, especially for long-distance and international calls.
  • Portability: Users can make and receive calls from any location with an internet connection, providing greater flexibility for businesses and remote workers.
  • Advanced features: Internet Telephony services typically offer a range of additional features like call forwarding, voicemail, video calling, and conference calls.
  • Scalability: VoIP systems are easily scalable as businesses grow and require more extensions or lines.

What are some limitations of Internet Telephony?

Some limitations of Internet Telephony include:

  • Internet dependency: VoIP systems rely on a stable internet connection to work effectively. Poor connectivity or internet outages can cause call disruptions or loss of service.
  • Latency and call quality: Call quality on VoIP systems may vary, depending on the speed, stability, and bandwidth of the internet connection.
  • Emergency services: Some VoIP services may have limited or no access to emergency services like 911.
  • Power outages: In the case of a power outage, traditional phone lines generally continue to work, while internet-based telephony systems may lose functionality unless the user has a backup power source.

Can I keep my existing phone number if I switch to Internet Telephony?

Yes, most Internet Telephony providers offer a process called ‘number porting’, which allows you to transfer your existing phone number to the VoIP service. The process may take some time, and a temporary phone number may be provided for you to use during the transfer. It’s important to check with your chosen VoIP provider if they support number porting before making the switch.

Related Technology Terms

  • VoIP (Voice over Internet Protocol)
  • Softphone
  • Session Initiation Protocol (SIP)
  • Unified Communications
  • IP-PBX (Internet Protocol Private Branch Exchange)

Sources for More Information


About The Authors

The DevX Technology Glossary is reviewed by technology experts and writers from our community. Terms and definitions continue to go under updates to stay relevant and up-to-date. These experts help us maintain the almost 10,000+ technology terms on DevX. Our reviewers have a strong technical background in software development, engineering, and startup businesses. They are experts with real-world experience working in the tech industry and academia.

See our full expert review panel.

These experts include:


About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

More Technology Terms

Technology Glossary

Table of Contents