MAKE ANSWERING EASY

Build reliable call notifications into your application 

Ensure users get reliable, real-time call notifications with our SDKs and API. You’ll see better connection rates and have happier users on any app with in-app calling.

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Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world

BOOST YOUR CONNECTIONS 

Reliable push alerts that keep users connected everywhere

Sinch call notifications use Apple Push Notification Service (APNs) and Firebase Cloud Messaging (FCM) to wake your app and display an incoming call screen instantly. That means more calls answered, a better experience for users, and stronger engagement on both iOS and Android. 

Increase call reliability

Never miss an important call. Push alerts wake the app and show the incoming call screen in real time.

Enhance user experience

Fast, intuitive call notifications make in-app calling smooth, meaning happier users that keep coming back.

Drive app stickiness

Dependable real-time communication keeps users connected with your app, so they don’t move to other channels.
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RELIABLE CONNECTIVITY 

Reliable call alerts when it matters most 

Sinch SDKs use APNs (iOS) and FCM (Android) to trigger call screens quickly, even if the app isn’t in the foreground. Delivery depends on OS rules and device settings, but our APIs handle the integration details so you don’t have to. 

  • Reduce missed calls through fast push notifications

  • Improve user engagement on your app

  • Protect important conversations

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CROSS-PLATFORM REACH

Cross-platform SDKs to save your team time 

Built-in support for APNs, FCM, and HMS, plus SDKs for iOS, Android, and JavaScript means your team only has to code once to deliver reliable in-app calling to users everywhere.

  • Works on iOS, Android, and Huawei 

  • One SDK does it all, meaning less work for your team 

  • Global Android compatibility out of the box 

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ENTERPRISE-GRADE RELIABILITY 

Trust a platform built for high availability 

A globally distributed, ISO 27001 certified, GDPR-compliant architecture delivers the uptime, security, and scale modern apps need.

  • High availability SLA across five AWS regions 

  • ISO 27001 certification and GDPR compliance

  • Cloud-native foundation with automated monitoring 

REAL-WORLD IMPACT 

Everyday uses for call notifications

Ride-sharing & delivery 

Notify drivers and customers to coordinate pick-ups, drop-offs, or last-minute changes so no one misses a beat while on the go. 

Telehealth consultations 

Quickly connect doctors and patients for virtual visits, so missed calls don’t get in the way of care quality. 

Social & communication apps 

Users can get real-time voice invites, keeping conversations inside your platform. 

In-app customer support 

Customers get instant callbacks from support agents within the app, making issues easier to resolve and boosting satisfaction. 

KEY CAPABILITIES 

Everything you need to deliver dependable alerts 

Push Notifications 

Built-in APNs and FCM alerts let users know instantly about incoming calls on iOS and Android. 

Wake-up Functionality 

Automatically starts or brings your app to the front so users can answer calls without waiting. 

Multi-platform SDKs 

Unified SDKs for iOS, Android, and JavaScript make it easy to add calls across all your devices. 

FCM Support 

FcmPushConfiguration provides Google push support with minimal setup for Android users. 

HMS Support 

HmsPushConfiguration extends reliable call notifications to Huawei devices. 

UserController API

Register, renew, or remove push tokens anytime for full control over notifications. 


ISO 27001 Certified 

Adheres to internationally recognized information security standards to safeguard your data. 

GDPR-Compliant 

Designed for full compliance with European data privacy regulations, protecting customer trust. 

Call notifications FAQs 

Configure APNs for iOS and FCM for Android, add credentials to Sinch, and register the device with the Sinch SDK at startup.

The device OS will block alerts. Your app can alert users and prompt them to turn on notifications for reliable in-app calling.

APNs or FCM will deliver the call notification once the device reconnects, but the alert may end if the device remains offline for too long.

Call notifications are included in In-App Calling’s pay-as-you-go pricing—no surprise separate fees here.

Integrate the Sinch In-App Calling SDK and configure your app to receive APNs and/or FCM push notifications. 

Ready to build call notifications into your app with Sinch Voice API?

See how our SDKs help you deliver seamless call alerts on iOS, Android, and Huawei.