Top 10 Voice Call APIs in 2025

"Find here the top voice call SDKs in the market that help you build a crystal-clear communication app and foster seamless conversation."

Want to build a communication app like WhatsApp or FB so that your users can engage in one-to-one audio calls or group conference calls? Then you must use a voice call SDK. Because, with no or minimal codes, you can integrate all the advanced calling capabilities in minutes.

But which to opt for? That is what this blog is all about, helping you discover the best 10 phone call SDK providers in town that developers love to create their own voice chat app. And before we delve into this topic, let us see its basics.

What Is A Voice Call API?

A voice call API (Application Programming Interface) is a technology that allows developers to easily add advanced voice calling features like single and group calls, call recording, file sharing, and other attributes into their apps, communication systems like VoIP, or websites without writing codes from scratch or ground zero.

And by now, these voice call SDKs are highly used by businesses to create solutions like call center software, support systems, click-to-call apps, and many more.

Best 10 Voice Call API Provider For Lasting Engagements

There are plenty of providers in the market that excel in features, pricing, and customizability. Hence, we have come up with the top 10 API solutions that are bound to offer the best services, user-friendliness, and pricing.

1. MirrorFly

MirrorFly comes to businesses and developers as one of the leading CPaaS providers of in-app video, voice, and chat solutions, helping them to build top-notch, powerful, and engaging communication apps.

Besides the fact that the provider offers 1000+ call and chat features like single and group calls, call muting, call logs, and others, their prime highlight is the self-hosted solution. Meaning, with it, you can avail complete customizations on their source code and build a chat software that your business would want to.

Along with this, their APIs and SDKs offer great scalability, tight security, multi-tenancy support, pre-built UI kits, and much more to build engaging voice calling apps.

Pros

1. The platform's APIs and SDKs can easily handle the volume of any traffic.
2. Supports integration with other tools and software
3. Offers 100% customization on their source code and offers whitelabeling.
4. Does not require any coding knowledge and you can even hire developers to complete setup.

Cons

1. Features are abundant, and need thorough understanding of them.
2. You must contact sales for detailed pricing.

2. Twilio

Twilio is one of the leading in-app voice calling API providers in town that offers low-latency voice communication along with messaging and video calling capabilities too.

Besides these, the platform also supports integrating some of the most-searched voice communication features like call routing, recording, transcription, and SMS too. Also, Twilio stands as the top choice for developers because of its reliability, scalability, and detailed guides.

Pros

1. It offers customization options on its features.
2. Twilio supports integration with third-party apps.

Cons

1. Pricing is high when compared to other providers.
2. You need expertise in coding as the setup is difficult.

3. Apphitect

Apphitect comes to developers as one of the best and most reliable whitelabel communication SDK providers that offers 100% customization on their video and voice calling, and messaging capabilities. Plus, they provide self-hosted solutions to businesses so that they give flexibility to them to host their data and apps on their own servers and take full ownership.

Also, their APIs are designed to be secure, scalable, and render 99.999% uptime SLA. All of which are great to deliver perfect messaging experiences.

Pros

1. Presence of abundant voice calling features that enhances user engagement.
2. Supports integration with CRM and other third-party software.

Cons

1. One needs technical knowledge to use their APIs and SDK.

4. PubNub

PubNub, is one of the unique voice API providers that comes as a global data stream network to businesses who specialize in offering real-time communication solutions for IoT and mobile apps. Plus, it offers low-latency calling and is designed for chat applications that require high concurrency.

Also it has some of the unique features like data synchronization, presence detection, live collaboration, and push notification.

Pros

1.Easy to integrate into apps.

1. Supports live data streaming too along with voice calling.

Cons

1. PubNub caters to limited use cases.

5. Plivo

The next provider in the list is Plivo that is known for its robust and powerful APIs and SDKs that caters to businesses of all kinds. It offers attributes like call routing, IVRs, and voice broadcasting.

Along with this, it also helps developers to add automated workflows, voice notifications, and many more advanced features. They also offer know-how guides to educate businesses on the implementation capabilities.

Pros

1. Plivo offers PHLO which is a no-code builder for non-coders.
2. It has special features to protect sensitive information.

Cons

1. They do not have a customer support system to resolve queries.

6. Telnyx

With the help of Telnyx cloud communication platform, businesses can build scalable chat software with reliable features that users would simply love.

Plus, their voice API and SDK helps in integrating features like SIP trunking, call control, and call recording thus making it ideal for call center solutions. Also they come up with developer guides to train them on how to integrate their APIs.

Pros

1. They have a very intuitive user-interface that makes it easy for quick navigation.
2. Gives updates on a regular basis.

Cons

1. Sometimes the users have faced issues related to security and transparency aspects.

7. Exotel

Now this voice API provider helps businesses to manage their internal and external communication by adding features like IVR, call routing, messaging, and automated voice alerts.

Additionally, Exotel comes at a very low infrastructure cost with high-end security and compliance parameters thus making it suitable for e-commerce and telehealth industries.

Pros

1. Developers can set up and use their service without any difficulties.
2. The platform helps boost customer satisfaction rates through IVRs.

Cons

1. Some users felt the interface to be outdated and less informative.

8. MessageBird

MessageBird is one of the phone call API providers that gives developers the flexibility to add inbound call automation capability along with analytics and voice messages. Also, it provides omnichannel support thus making it easy for businesses who need to add SMS, email, and WhatsApp into a single app.

Additionally, its AI-driven voice features help to build smart communication systems to deliver personalized experiences.

Pros

1. Supports integration with other channels.
2. Gives documentation to developers to guide them on the integration process.

Cons

1. Set up codes are pricey and hence not suitable for small businesses.

9. RingCentral

From adding voice calling to conferencing to call management features, RingCentra's voice APIs help developers to build an amazing communication software that users would simply love. Plus, it supports VoIP calls at the best quality, call routing attribute, and CRM integration capability that makes it easy for enterprises who are looking to streamline their chat application.

Another merit of using this provider is that they give the flexibility to integrate with tools like Teams, Salesforce, and Slack to boost customer engagement levels.

Pros

1. Offers advanced call management features that most of the other peers do not.
2. A single platform combines video, voice, and chat features.

Cons

1. Pricing is very high compared to other providers.
2. Certain features need a learning curve thus making it difficult for newbie developers.

10. Sinch

The last one in our list is Sinch that is fastly growing as one of the reliable providers of voice APIs and helping companies build high-quality apps with advanced features like SIP trunking, call verification, programmable calling, and more.

Plus, this cloud communication platform is easy to use, secure, scalable, and has an AI-powered voice bot support which makes it easy to build customer support applications.

Pros

1. Offers great quality voice calls.
2. Supports different programming languages and frameworks.

Cons

1. Pricing is a bit difficult to understand and platform is a little complex

Key Features To Look For In A Voice Call API

Now that you are satisfied with the thought that audio calling SDKs and APIs are highly beneficial for your business, when you choose one, it is required that you see for the following factors:

1. Customization options: Always go ahead with third-party audio call SDK providers who give you endless customization capability so that you can tailor create your app based on your business needs.

2. Scalability: You want an API that can grow when your business grows so that your app can easily handle call volumes.

3. Security: This is one of the crucial factors as you do not need your data to be hampered by prying eyes. So look for providers who promise E2E encryption and are compliant with industry regulatory standards.

4. Abundant features: Your customers or users would be glued to your app only if they find it to be impressive and to make one, you need features like call recording, single chats, conferencing, text-to-speech, call routing, scheduling, transferring, and much more.

5. Low latency: Ensure that your choice of provider offers your users to make high-quality calls without any glitches or hitches.

6. Compatibility: Look out for voice call APIs that work seamlessly well across different platforms like web, mobile, and VoIP.

Wrapping Up!

With technology advancing at a much faster pace, it has become easy for businesses to build instant voice-enabled apps using an audio call API and SDK.

But, they lack guidance in which provider to choose for their business needs and that's where we stepped up and gave you a detailed insight on each of the top providers in town.

So, do take a minute to go through each before making a decision and yes happy integrating!