In-App Voice Calls

Globally available VoIP calls from within your apps

What is in-app voice calling or data calling?

Using this product, you will be able to integrate voice calling capabilities inside any app you build. These calls are directly connected to the person at the other end using VoIP. For example, a cab driver will be able to call a rider from within the app, without having to spend money on a voice call.

Who can use App to App calling?

Here’s how in-app calling can be used by different industries



Connect buyers and sellers or peers using the app

Dating Apps

Keep conversations private and within the app

Cab aggregators

Driver & rider calling will be hassle-free from within the app

Hiring Platforms

Track recruiter & applicant conversations from inside the app


Peer to peer selling becomes simpler with app to app calling

How it works


User clicks on call button in the app


Call gets initiated to the person at the other end


They can answer it within the same app

How does this help a business?


Every interaction is encrypted and all the sessions are secure. Built with an enterprise first focus.



With data plans becoming cheaper than voice plans, this is a huge cost saving for both the company and their clients


Since the calls are not routed via any phone number, the customer’s information remains safe and private



Since all the conversations are contained within the app, they can easily be tracked for all business purposes

The Exotel Advantage

Why Exotel is considered as the most reliable cloud communications company in Indonesia and Southeast Asia


Superior Quality

Best success rates, voice quality and reduced latency


Scale at Ease

Grow at will, expand without worrying about infrastructure


Superior Reliability

Best in class uptimes of 99.94% including operator uptimes


Best Support

24×7 customer support via phone, email and Twitter


Simple to implement

Sign up and get started in less than 30 minutes, integrate easily using our REST APIs


Extensive Reporting

Easy to understand, detailed reports sent every day

Asia’s most innovative companies use Exotel

Shashank ND

We have worked across cloud telephony players and with other vendors, but the fact is Exotel is dependable.

Co-Founder & CEO, Practo

Sudhanshu Raheja

In terms of delivery rates, we have been able to push it up from about 84% to 92%

Head of Mobile, GOJEK

Shirish Subramanian

Great product, great team, and we’d love to see you scale crazy heights.

Head - Sourcing & Operations, Fabelio


Exotel's automated calls have helped in increasing our service levels and reducing our costs since there is no need for any manual intervention.

Senior Manager - Operations and Strategy



Can these calls be tracked?

Yes, all the in-app calls are tracked. You can find the status of the calls under the Inbox tab or the reports section.

Can I make video calls?

No, we currently don’t support video calls. But our team is working on it. Fill the form to join our waiting list.


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What platforms are supported in AppToApp calling?

Currently, we only support Android but we’ll be rolling out support for iOS soon. Be the first one to know by joining our priority list.


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Where is my data stored?

The Android SDK doesn’t store any data on the device. All data like call recordings and tracking details are securely stored on Exotel’s servers.

How is AppToApp calling different from a traditional call?

Unlike normal PSTN calls, the AppToApp calls are made over an internet connection. It doesn’t require a caller ID or any telephony infrastructure.

What is the rate limit per account?

By default, the rate is limited to 1 call per second. You can increase this by reaching out to your account manager.


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Can existing Exotel customers leverage AppToApp calling?

Yes. Please reach out to your account manager to get this service enabled or write to us for details.


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Can the SDK make App to PSTN calls?

No. This is not legal in India as per TRAI. To know about other countries, please contact our sales team.


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Can AppToApp call work in the 2G network?

Customers can effortlessly communicate as long as the speed is above 24kbps uplink/downlink during the call session. Our SDK handles the network transition across 2G/3G/4G seamlessly.

What Android version is supported?

Currently, we support Android devices on Lollipop (v5.0) and above.

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We take away some of the biggest pain points of traditional systems like EPABX.