Hassle-free, scalable calling experience
Level up user experience
Get real-time insights into caller identity and history for quicker, personalized problem solving.
Connect with confidence
Connect users without revealing phone numbers, keep identities secure, and transactions on-platform.
Future-proof your business
Upgrade your in-app contact center and CRM platform with high-quality in-browser calling in no time!
We opted for Sinch due to the quality, ease of integration and excellent customer support.
Connect with customers around the world in seconds
Send data directly to the receiver. Less time traveling means better quality, and we always take the fastest route.
We’ve got regional data centers in every corner of the world, ensuring global reach with the lowest possible latency.
Add voice and video calling to apps or web browsers in no time with our SDK.
Pay as you go
No hidden charges, no upfront payment - pay for what you use, when you use it.
Build trust and protect customers and staff - privacy and security guaranteed.
Make the most of our cloud-based in-app calling platform - it’s secure, stable, and 100% future-proof.
Got questions? We've got answers!
Which technology do you use for making calls?
Sinch In-App Voice Calling uses the WebRTC framework - the most frequently used voice and video calling technology for IP-based communication. WebRTC combines multiple technologies to ensure the best call quality around.
Which codec do you use, and do you use WebRTC?
Our technology supports multiple protocols, but we mostly use OPUS. It's a flexible auto-codec that adapts voice quality to suit network quality - a good connection results in HD voice quality.
The video codec we mostly use is VP8.
What scalability options does Sinch offer?
Sinch powers all kinds of applications, from MVP prototypes to successful and widely used applications. Our services scale on demand and offer high availability at all times.
How much mobile bandwidth does the Sinch SDK use?
It depends on the type of calls - voice app-to-app, video app-to-app, or app-to-phone. Need more details? Contact us to get a copy of our guide!
Does the Sinch SDK work behind symmetric NATs?
The Sinch SDK uses P2P for the voice stream when possible. We use the ICE standard for NAT traversal. If a P2P channel isn’t possible - for example when both sides are behind a symmetric NAT - the voice channel will fall back to Sinch media proxies. 70-75% of calls made will go over P2P, and 25-30% will go through servers due to firewall restrictions.