Best VoIP Calling Software to Build a Calling App

Is Your VoIP App Secure?

Did this sentence make you stop and think?

If yes, don’t skip this article.

Third-party VoIP apps are highly vulnerable to data breaches and leaks, almost every day. And the last thing you want is your users’ data being exposed in insecure VoIP calling apps.

But don’t worry. There’s a solution that lets you customize security and keep data under control.

Building your own VoIP app with custom security.

You read that right!

Developing a custom VoIP app is not a distant dream anymore, with pre-built VoIP SDKs.

In just a few hours, you can create a secure, white-labeled VoIP calling app. And this article will discuss everything about it.

In the next 10 minutes, you’ll learn (and build):
✅ What a VoIP SDK is
✅ The top VoIP software solutions
✅ Steps to build a custom SIP calling app with your branding and features

Ready to get started?

If you are new to VoIP SDKs, here is a quick intro to this amazing technology.

What is VoIP SDK?

A VoIP SDK (Voice over Internet Protocol Software Development Kit) is a collection of APIs, tools and libraries that lets you integrate voice and video calling features into web and mobile apps.

There are 100s of VoIP SDKs out there, making it easier than ever to build feature-rich VoIP calling apps, and it can sometimes get overwhelming to choose the best among them. So, here’s a quick list of our suggestions with hand-picked VoIP softwares from the leaderboard.

Top 5 VoIP Calling Software [2026 Reviews]

Our community of 430+ developers tried and tested almost 27 VoIP calling softwares, and here are the 5 solutions that they voted to be at the top of the list:

1. MirrorFly

Customizable VoIP Calling Software

MirrorFly is a powerful white-label real-time communication solution that offers VoIP call features with advanced security. It comes with a highly customizable VoIP calling solution. You can use this solution to build a complete VoIP calling app, with 1000+ features including voice broadcasting, video conferencing, screen sharing and live streaming.

One of the topmost reasons why we’ve placed MirrorFly at the top of all, is its 100% customization. You can literally customize anything and everything you use with MirrorFly.

The deployment with MirrorFly is a satisfactory experience as it offers both on-premise and on-cloud options. This means, you’ve got all the freedom to choose where you want to host and manage your VoIP platform.

Coming to the core of why we started this experiment with VoIP calling solutions, MirrorFly stands out tall with its custom security features. You can add any number of encryptions above MirrorFly’s already-robust encryptions, SSL, and industry-grade regulations.

2. RingCentral

Comprehensive Cloud Communication Solution For Modern Enterprises

RingCentral is a cloud-based communication platform that offers modern features such as VoIP calls, video meetings, team messaging and SMS. It also has call management and auto-attendant features that drive unlimited customer interactions and internal workflows.

When it comes to compatibility, RingCentral works for businesses of all sizes, helping teams connect and collaborate more efficiently. Besides, it also offers a desktop and mobile VoIP app that can operate on all devices.

3. Nextiva

Reliable, All-In-One VoIP & Unified Communications Platform

Nextiva is a unified communications platform that simplifies business interactions with its reliable VoIP calling and collaboration tools. It combines all the features you expect in a modern VoIP calling software such as voice, video, messaging, and CRM features.

With 24/7 support, easy-to-use interface, high uptime, and mobile access, Nextiva ensures that your teams stay connected anytime, anywhere easily.

4. Dialpad

AI-Powered VoIP Calling For Innovative Teams

If you're interested in using AI-powered VoIP solutions, your best bet would be Dialpad. It comes with smart features like call transcriptions, analytics, and insights along with the basics such as voice, video calling and instant messaging.

Dialpad saves you a lot of time as its AI-driven automation simplifies tasks and gives you all the data you need for tuning your business' engagement strategy.

5. 8x8

Enterprise-Grade VoIP Calling

8x8 is a secure cloud-based communication platform that offers an extensive range of enterprise-grade VoIP calling and unified communication tools. In this solution, you'll find customer engagement features such as voice, video, chat, and contact center services.

If your business relies on third-party tools, integrating a phone calling app with this online calling app platform ensures seamless connectivity. In fact, 8x8 helps you achieve this easily, while offering high uptime and excellent call quality.