Trusted by some of the biggest companies in the world

voip logo

Experience exceptional voice quality

Our expansive tier 1 network is the highest quality with 99.999% service availability and 43 geo-redundant points of presence across the U.S.

Achieve reliable reach

With the largest facilities-based footprint covering 95% of the U.S. and carrying 300B minutes of use annually, you’ll have an experienced team to support your voice needs.

Discover ultimate scalability

Instantly increase your capacity to any requirement with an extensive number inventory to adjust to your growth or spike in calls.

icon - globe with arrows circling

Global reach and local presence

Always get the best call quality at the best possible price thanks to our regional cloud deployments, ensuring global reach and low latency, and robust network of local operators all around the world.

1 of 4
Number masking animation

Build conversations where they matter

Implement voice calling, sit back, and enjoy higher engagement, efficiency, and flexibility - and reduced costs!

Keep it simple and scale faster with a complete solution powered by a global carrier network for high-quality voice calling and guaranteed call delivery. 

Tango case study
Illustration of two people talking

Top-notch quality and cross-platform support

Our programmable Voice API reaches customers on any platform or channel! Integrate PSTN, SIP, and VoIP calling to manage calls on apps, web browsers, mobile phones, or landlines. 

Enjoy a high-quality voice experience, optimized delivery routes, and carrier super network - all in one place. 

Build the call experience you need

Not a developer? No problem! Use our web portal to make your first call in just a few simple steps - no coding required.

Get started in a snap with our user-friendly, scalable Voice API:

  "method": "ttsCallout",
  "ttsCallout": {    
  "cli": "+14045001000",    
  "destination": {      
  "type": "number",      
  "endpoint": "+14045005000" 
  "locale": "en-US",    
  "text": "Hello, this is a call from Sinch."  



Get your hands on local or national mobile and toll-free numbers for calling in 80+ countries - no need to deal with local number polls.

Call recording

Get smart and step up customer communications - record all calls with a phone call app - inbound and outbound!

Recorded prompts

Upgrade the customer experience with pre-recorded phrases in customized online phone conversations.

Interactive Voice Response (IVR) menus

Improve call center performance and enhance the customer experience with programmable IVR systems. 

Answering machine detection

Filter out answering machines and let contact center agents focus on live calls only.

Voice-based IVR

Let callers interact with the IVR and respond to prompts verbally - our new voice IVR has speech recognition! 

SIP trunking

Enjoy maximum flexibility and make sure your voice calls always take the shortest and quickest route with our SIP platform. 

Conference calling

Gather up to 100 people in one online phone call, forget expensive travel costs, and connect with anyone anywhere in the world. 


Reach more people with minimal effort! Our text-to-speech feature turns text into audio and supports multiple languages.

Pay as you go

Enjoy reduced costs compared to in-person meetings without any  upfront payments nor hidden charges - pay for what you use, when you use it.

Number masking

Protect your business and customers by keeping personal numbers safe with anonymized voice calls.

Local presence

Boost brand recognition and build trust by using local 10DLC numbers for more personal two-way conversations.


Help customers feel confident picking up phone calls with a trusted caller ID.

1 of 13

Got questions? We've got answers!

  • What's the difference between phone calling and in-app voice calling?

    Phone calling is a traditional telephone call - both the caller and the person being called are using a phone line via a mobile device or landline. In-app voice calling is a software-based call with audio and/or video information sent over the internet between the caller and the recipient.

    Once integrated into your app, users can make calls from their computers or mobile devices. 

  • How do I get started with Sinch phone calling?

    It’s simple! First, create an account on the Sinch portal. Then, create a voice application, and you’ll receive a set of credentials (key and secret). With these credentials, you can use our REST APIs to trigger and receive calls, bind multiple calls into a conference, manage your call flow via our callback API, and more. You can also rent and manage phone numbers. 

  • How do I rent numbers?

    You can easily find numbers from a wide range of countries in the portal - just sign in! Some countries require a local presence and additional company information before we can source you a number. If you’re interested or have any questions, talk to us. 

  • Can I integrate Sinch Voice Calling via SDK?

    Users usually integrate our Voice Calling via our calling and callback REST APIs. At the moment, we offer a C# backend SDK available as a NuGet. New SDKs will be available in the future. 

  • Can I voice-enable my local 10DLC number?

    Absolutely! Apart from SMS and MMS, 10DLC also supports voice calls.  And of course, with our super network, carrier-grade platform, and deep technology knowledge, you’re sure to get a top-notch, cost-effective voice solution!

Our pricing page is on the way! In the meantime, get in touch to discuss pricing

illustration hand with icons

Number Masking

Masking numbers to anonymize voice calls can protect you and your customers while keeping personal numbers safe.


Fight back against robocalls, increase call answer rates, and build consumers' trust.
Number Porting

Number Porting

Port numbers quickly and easily with Sinch - keep customers happy and business flowing!
1 of 6

What are you waiting for? Step up customer interactions now

Illustration of a girl talking in a handset

Try out Sinch now - for free!

No credit card needed
Send free test messages
Easy integration with Sinch API
Access your API credentials and manage your settings and configuration