Data Calling

You’ll have them at hello

It only takes seconds for people to decide if they
like a voice or not. Use our app to app phone
calling SDK to establish trust & build more
personal relationships with your customers.

Get to know your customers
Our easy to set up and use app to app phone calling API can help you get a handle on metadata & know the identity & context of callers to help them get to a solution quicker, making the customer experience and data voice calling a breeze.
Provide real-time communication
You’re in good hands, with over 250 million calls per month running through our app to app calling API, we know how to start personal conversations between you & your customers - it's a Sinch!
Get crystal clear quality
For over 10 years we’ve gathered deep knowledge on WebRTC, & fine-tuned our VoIP services, to make it easier for you to enjoy HD quality voice calls via our app to phone calling API and SDK.

Side-by-side smartphones displaying a phone call between a taxi driver and a prospective passenger

The Essentials

Conference calling

Gather up to 100 people in one single call thanks to our app to app calling API, lose the travel costs & share ideas with anyone in the world.

Text-to-speech

Get your message past bad eyesight, short attention spans, or tiny screens by reading it out loud with our Voice SMS API.

Call recording

Record all incoming & outgoing calls, get smarter & make customer communication even better.

Recorded prompts

Use pre-recorded phrases to customize conversations & make the app to app calling experience more pleasant.

IVR menus

Make your phone calling apps and customer support flow effortlessly by letting callers press a couple of buttons to automatically get in touch with the right person for the job.

Cross-platform support

Make it possible to call anyone with a connection, regardless of platform preference. Our SDKs cover iOS, Android & Javascript.

Stability & support as standard

Carbonapps help friends & family keep in touch via yabChat

Carbonapps needed a reliable app-to-app voice and video calling solution for their yabChat Messenger app - they turned to Sinch for the answer.

"We opted for Sinch due to the quality, ease of integration and excellent customer support."

Eddie Siah-Armah, Director of Operations, Carbonapps

Phone display of a phone call from the Rebtel app

Enabling crisp, HD quality calls

Rebtel are an international VoIP company

Rebtel providing international calling apps for iPhone, Android, Windows Phone and PC are powered by app-to-phone calls and SMS by Sinch.

“Sinch gives us a mix of fantastic quality and solid reliability that the Rebtel app depends on."

Anna Alenius-Mathson, Head of Communications, Rebtel

Communications

Data Calling Pricing

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Global coverage
Free test credit
Easy to use APIs & SDKs

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FAQs

The Sinch SDK will use P2P for the voice stream when possible. The ICE standard is used for NAT traversal. If a P2P channel is not possible (for example when both sides are behind a symmetric NATs) the voice channel will fall back to Sinch media proxies. Approximately 70-75% of the calls made with the SDK can be expected to go over P2P, while approximately 25-30% of the calls can be expected to go through servers. This is due to firewall restrictions.

Get More

Cast an eye over our related products, built to make your engagements even better.

Phone Calling Phones are still the undefeated champion of communication. Everyone’s got one & networks are already in place. A call is efficient, personal & you can reach people anywhere!