What are softphones? A complete guide for teams

With the rise of internet-based communication, more people are turning to softphone applications instead of traditional public switched telephone network (PSTN) calling solutions. With softphones, all you need is an internet connection to make a call.

As communication technology advances, softphones are changing how businesses manage voice communications—especially in sectors with strict regulatory requirements and high-volume customer interactions.This comprehensive guide explores what a softphone is, how it functions, and the major benefits it provides to businesses.

How the remote work explosion made desk phones obsolete

For decades, the office desk phone was business infrastructure as fixed as the building itself. Then distributed work changed everything. In 2019, just 6.5% of private-sector workers primarily worked from home. By 2023, 35% of employed Americans did some or all of their work remotely—a fivefold increase in just four years. By Q1 2024, 35.5 million Americans were working remotely, up 5.1 million year-over-year.

The chart above tells a story that's still unfolding. Remote and hybrid work aren't a pandemic blip—they're a structural shift. And that shift created an immediate, practical problem: desk phones don't travel.

Traditional office phone systems tie employees to a specific extension at a specific desk. When the workforce dispersed, companies faced a choice: ship hardware to thousands of home offices or find a software solution. Most chose software. A softphone app running on a laptop or smartphone replicates every function of a desk phone—and then some—without shipping a single handset.

The business logic is straightforward. A distributed workforce needs communication tools that are just as distributed. Softphones deliver a professional phone presence from any internet connection, on any device, anywhere in the world. That's not a feature—it's now a baseline requirement for companies that want to stay connected across time zones and work arrangements.

David Casem, CPO @ Telnyx

The remote work revolution forced a reckoning with legacy phone infrastructure—and softphones emerged as the clear answer. Understanding how they actually work explains why they've become the default communication stack for modern distributed teams.

Understanding softphones

A softphone is a software application that allows users to make telephone calls over the internet using a computer, smartphone, or tablet. Unlike traditional phones, softphones don’t require dedicated hardware. Instead, they use the device's existing internet connection and audio hardware. This flexibility makes softphones an ideal solution for modern businesses seeking cost-effective, scalable, and secure communication options.

For example, a global customer service company might use softphones to connect its agents across different continents seamlessly. By leveraging softphones, the company can ensure high-quality communication without the expense of traditional phone systems.

All in all, softphone applications are known for their practical benefits and versatility in a real-world business environment.

How softphones work

Softphones function by leveraging Voice over Internet Protocol (VoIP) technology. VoIP converts voice signals into digital data packets, transmits them over the internet, and reassembles them into voice signals at the receiving end. Here’s a detailed breakdown of the process:

VoIP technology

At the core of softphone functionality is VoIP technology. Softphones use VoIP protocols, such as Session Initiation Protocol (SIP), to initiate, maintain, and terminate voice calls. VoIP works by converting voice signals into digital data packets, which are transmitted over the internet.

When a user speaks into their device's microphone, the softphone app captures and encodes the audio into these data packets. These packets are then sent to the recipient’s device, where they’re decoded back into audio. This process ensures voice communication remains clear and reliable.

User interface

Softphone apps typically feature an intuitive user interface that resembles a traditional phone dial pad. Users can dial numbers, access contacts, and manage call settings through the app. Many softphones also offer advanced features such as video calling, instant messaging, and conference calling, enhancing their utility beyond simple voice communication.

Additionally, they often provide customizable settings and integrations with other business tools, allowing users to tailor their communication experience to meet specific needs and preferences.

Integration with existing systems

Softphone apps can integrate with various business systems and customer relationship management (CRM) tools. This integration allows for seamless communication within an organization and improves efficiency by providing access to contacts and call history directly within the app.

These integrations also facilitate streamlined workflows and data synchronization across platforms. Various software options are available, offering different features and user interfaces.

These components, paired with a reliable internet connection and audio hardware, are crucial for effective communication.

Key benefits of softphones

Using internet-connected devices like softphones has several key advantages compared to traditional telephony solutions:

Enhanced communication reliability and security

Since softphone apps can be installed on any internet-connected device, they increase mobility by freeing users from specific locations. This is a key advantage for remote workers and businesses with multiple locations. They also meet strict communication standards for industries like finance and healthcare, ensuring enhanced security and compliance.

• High uptime: Softphones typically offer high availability and reliability, crucial for maintaining consistent communication.
• Compliance and security: Advanced encryption and secure VoIP protocols ensure that voice communications adhere to industry-specific compliance requirements, safeguarding sensitive information.

Improved operational efficiency

Softphone apps offer sophisticated call management features, including call forwarding, voicemail, call recording, and auto-attendant. These features ensure important calls are never missed and communication workflows are efficiently managed. They also streamline call center operations and reduce manual intervention.

• Call routing: Automatic call distribution (ACD) systems route calls to the appropriate agents based on predefined criteria, reducing wait times and improving customer satisfaction.
• Conferencing and collaboration: Built-in conferencing tools facilitate seamless collaboration among team members, enhancing productivity.
• Speech recognition: Real-time speech recognition and transcription capabilities enable efficient call handling and documentation.

Cost management

Adopting softphones can lead to significant cost savings for enterprises by using the internet for calls, which helps avoid traditional phone line charges and long-distance fees. Many softphone providers also offer affordable subscription plans, making them a cost-effective solution for businesses of all sizes.

• Reduced operational costs: Softphones eliminate the need for traditional phone lines and hardware, lowering infrastructure expenses.
• Scalable solutions: Businesses can scale their communication infrastructure up or down based on demand, avoiding the costs associated with over-provisioning.
• International calls: VoIP technology enables cost-effective international calling, reducing expenses for businesses with global operations.

Increased customer satisfaction

Softphones enhance the quality of customer interactions, leading to improved satisfaction and loyalty. Features such as high-definition audio and real-time call monitoring ensure clear and effective communication. Additionally, advanced tools like call recording and analytics provide valuable insights for continuous improvement in customer service.

• Clear communication: High-definition audio ensures clear and uninterrupted conversations, reducing misunderstandings and frustration.
• Real-time features: Features like call recording, real-time call media access, and agent coaching provide valuable insights for improving customer service.
• Flexible contact methods: Softphones support multiple communication channels, including voice, video, and instant messaging, catering to diverse customer preferences.

Ease of integration and usability

Designed to integrate seamlessly with existing enterprise systems, these applications are user-friendly for both technical and non-technical staff. This ease of integration and usability ensures that organizations can quickly adopt and benefit from advanced communication features without disrupting their current workflows.

• API integration: Robust APIs allow softphones to integrate with CRM systems, help desks, and other enterprise applications.
• User-friendly interfaces: Intuitive interfaces make it easy for users to adopt and manage softphones, minimizing the learning curve and maximizing efficiency.

Scalability

Scalability is a crucial factor for growing businesses, and softphones excel in this area. They can easily handle increased call volumes and adapt to the growing needs of an organization without requiring significant infrastructure changes. This flexibility allows businesses to expand their communication capabilities efficiently and cost-effectively.

• Handling high volumes: Softphones can manage large volumes of calls without compromising on quality, making them ideal for call centers and customer service desks.
• Future-proof technology: As business needs evolve, softphones can be updated and upgraded with new features, ensuring communication infrastructure remains cutting-edge.

Innovation and technological leadership

Softphones often come equipped with features that facilitate collaboration, such as conference calling, video meetings, and instant messaging. These tools are essential for modern businesses that rely on teamwork and real-time communication, helping them stay ahead of the competition by leveraging the latest technological advancements.

• Cutting-edge features: Regular updates and new feature releases keep softphones at the forefront of communication technology.
• Promoting innovation: By integrating softphones into their operations, businesses can foster a culture of innovation and continuous improvement.

Softphones by the numbers

The shift from physical desk phones to softphones has accelerated dramatically over the past five years. These numbers help explain why businesses of every size are making the switch.

$11.2 billion — projected global softphone market size by 2028, growing at a 15.4% CAGR as enterprises prioritize cloud-first communications (MarketsandMarkets, 2023).

67% of remote workers report that softphone apps improved their work-from-home communication compared to traditional desk phones (Frost & Sullivan, 2023).

45–65% average cost savings on hardware and maintenance when businesses switch from traditional PBX systems to softphone solutions (Gartner, 2023).

David Casem, CTO @ Telnyx

The cost savings alone are compelling, but the real driver is flexibility. A softphone works on any device with an internet connection — your laptop, tablet, or smartphone — making it the natural choice for distributed teams.

As businesses continue to embrace hybrid work, softphones are quickly moving from a "nice-to-have" to a core part of the communication stack.

How to choose the right softphone app

Choosing the right softphone app is crucial for maximizing communication efficiency and ensuring your business operations run smoothly. With a variety of options available, each offering different features and capabilities, it's important to evaluate your specific needs and priorities. There are several key things to keep in mind when making your decision:

Compatibility

Ensure the app works across your existing hardware and software (Windows, macOS, iOS, Android). Verifying compatibility helps avoid integration issues and ensures a smooth user experience.

Features and functionality

Assess communication needs and choose an app with essential features like call quality, video calling, CRM integration, and security measures.

Ease of use

Look for an intuitive user interface with easy navigation, clear instructions, and accessible support resources to minimize the learning curve and maximize productivity.

Security

Choose an app with robust security measures, including encryption and other protocols, to protect sensitive voice data from unauthorized access and cyber threats.

By keeping all these factors in mind, you can find the right softphone app to meet your business’s needs.

Elevate your business communications with softphone technology

Softphone apps represent a significant advancement in communication technology by offering flexibility, cost savings, and a wide range of features that enhance both personal and business interactions. For enterprise businesses, they deliver enhanced reliability, security, operational efficiency, and cost management, ensuring high-quality, scalable, and secure voice communications that meet industry demands.

As technology evolves, softphones are expected to incorporate advanced AI features and integrate with emerging technologies like 5G, further improving call quality and solidifying their role in modern communication.

With the growing demand for softphone apps—driven by the shift from traditional PSTN solutions to internet-based communication—Telnyx offers an ideal solution for businesses. Telnyx's advanced WebRTC and Voice API products provide the essential tools for developing robust and scalable softphones tailored to your needs. Offering superior support and competitive pricing, Telnyx equips you with the building blocks to create and enhance softphone applications efficiently.

Frequently asked questions

What is a softphone?

A softphone is a software application that enables voice calling over an internet connection (VoIP) using a computer, smartphone, or tablet. Instead of a physical handset, the app uses your device's microphone, speaker, and internet connection to make and receive calls — often using a standard SIP protocol or WebRTC.

How is a softphone different from a regular phone?

A softphone runs as software on internet-connected devices and uses VoIP rather than traditional telephone networks. Physical desk phones (hard phones) require dedicated hardware, a physical connection to a PBX or phone line, and are location-dependent. Softphones travel with the user, work anywhere with an internet connection, and typically cost far less to deploy and maintain.

Are softphones secure for business use?

Yes, modern softphone apps use encryption protocols like SRTP (Secure Real-time Transport Protocol) and TLS (Transport Layer Security) to protect voice data in transit. Enterprise-grade softphones also support HIPAA-compliant configurations for healthcare and other regulated industries. Choosing a provider with a private IP backbone adds another layer of security by keeping calls off the public internet.

What do I need to run a softphone?

You need a compatible device (computer, smartphone, or tablet), a reliable internet connection (at least 100 kbps upload/download per call), a microphone and speaker or headset, and a softphone app with a configured SIP account or WebRTC setup.

Can softphones make international calls?

Yes. Softphones can place international calls at significantly lower rates than traditional carriers by routing calls over VoIP. A softphone paired with elastic SIP trunking from a global provider like Telnyx gives you access to local and international numbers across 140+ countries at carrier rates.

What is the difference between WebRTC and SIP softphones?

SIP (Session Initiation Protocol) softphones use a dedicated SIP client and SIP trunk, requiring configuration of server addresses and credentials. WebRTC softphones run directly in a browser using JavaScript and require no client installation, making them ideal for customer-facing applications and contact centers.

How much does a softphone cost?

Softphone pricing varies widely. Many enterprise UC platforms include softphone apps in their subscription. Standalone SIP softphone apps range from free (Linphone, Zoiper) to $10–$30/month per user for enterprise-grade apps. Per-minute call costs depend on your SIP provider's rates.