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ios voip


Adding VoIP to your iOS app is simple. At Sinch, we wanted to create a friction-free Calling & Messaging platform with a robust SDK. And we did. With our iOS VoIP SDK, you can quickly and easily add real-time communications to your apps in minutes, with just a few lines of code. Signup Now and see how quickly Sinch can start connecting your users.

The Sinch Code

App to App

App to Phone


id callClient = [sinchClient callClient];
[callClient callUserWithId:@"John"];
id callClient = [sinchClient callClient];
[callClient callPhoneNumber:@"+14154292072"];
NSString* phoneNumber = @"+14154292072"; id verification = [SINVerification SMSVerificationWithApplicationKey:@""

What our customers say


Sinch was just simple to use. My developers have said that Sinch was easily integrated and was one of the easiest SDK’s they have ever worked with.

Philipp Mintchin, CEO & founder of SPLYT

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We tested the market thoroughly, and we ultimately chose Sinch because of their high quality product, ability to scale, and excellent level of customer service.

Eric Setton, Co-Founder & CTO of Tango

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Sinch took 10 minutes to drop in and start calling, and the voice quality is amazing.

Jim Yang, CEO of Gather

Why Choose the Sinch iOS VoIP SDK?


Clean Documentation

Built with simplicity in mind, the Sinch iOS VoIP SDK is amazingly simple to use, with superior documentation for Developers

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WebRTC Adaptability

We use our own MXP signalling to offer a much more robust and lightweight alternative to SIP for WebRTC signalling.

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Industry Leading Codecs

Sinch uses the OPUS and iSAC adaptive codecs to offer the very best in WebRTC calling quality. On top of this, we support G.711, G.222, G.729, and iLBC.

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Start free, pay as you grow

We offer app to phone calls and SMS at market leading prices, giving you a powerful service at a fantastic price

The Sinch Difference


Simple to Use

App developers have complete control of the UI, call flow, and video stream with a quick import of the lightweight Sinch Video Chat SDK for seamless integration

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HD Quality

Easily arrange one-on-one or group video calls in HD quality for uninterrupted communication and enhanced productivity

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Start in Minutes

There is no need to use any backend to get started. Just import the Sinch real time video SDK into your existing project and start using our APIs to enrich your app in minutes

Get Started Today

Download the iOS VoIP SDK

Start integrating real time voice chat into your iOS applications

Quick Start Tutorials

Start integrating VoIP into your iOS applications quickly with our tutorials