MAKE YOURSELF HEARD

Crystal-clear, high-definition calling for every channel

HD Voice brings reliable, crisp audio to all your apps and communication channels. With Sinch, you get high-definition calling powered by our global, enterprise-grade network—so every conversation stays clear, secure, and uninterrupted.

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

TRUSTED VOICE COMMUNICATIONS 

Count on our global, enterprise-grade HD calling solution 

HD Voice is part of the Sinch Voice family, making it easy to add high-quality calling with over 99.95% uptime, fast setup through developer-friendly APIs and SDKs, and flexible pricing—you only pay for what you use.

Crystal-clear audio 

Wideband audio codecs make conversations sound natural and easy to understand, so no one has to repeat themselves. 

Enterprise reliability 

A Tier-1, geo-redundant network with direct connections in 60+ countries keeps you connected anytime, anywhere. 

Fast integration 

Add HD Voice to any app, contact center, or workflow in minutes with flexible APIs, SDKs, and elastic SIP trunking. 
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CALL QUALITY THAT DELIGHTS 

Make every conversation crystal clear 

Poor audio quality can hurt customer experience and slow down agents. Sinch HD Voice captures more sound frequencies for natural speech, so every call feels personal and professional. 

  • Fewer repeats and faster resolutions

  • Boost customer satisfaction scores

  • Consistently clear calls for global teams 

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ALWAYS-ON RELIABILITY 

Stay connected with a global Tier-1 network 

Your calls run on our geo-redundant backbone and an over 99.95% uptime SLA, so you can expand to new markets without worrying about lag or dropped calls. 

  • Direct routes in 60+ countries

  • 300B+ minutes carried each year

  • Geo-redundant network for high availability 

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SMOOTH SETUP 

Add HD voice anywhere, fast 

From apps to contact centers, HD Voice is ready to go with our Voice API, Elastic SIP Trunking, and In-App Voice & Video SDKs, helping you get to market even faster. 

  • Simple pay-as-you-go pricing

  • REST APIs, WebRTC, and SIP support

  • Works across desk phones, browsers, and mobile 

WHERE HD VOICE SHINES 

Ways businesses use HD voice 

Contact centers 

Crisp calls help agents resolve issues faster, reducing churn, increasing efficiency, and boosting satisfaction.
 

In-app calling 

Bring HD audio and video right into web or mobile apps for smooth, on-brand conversations worldwide. 


Conference calling 

Wideband audio ensures every participant is heard and meetings stay productive, wherever they’re joining from. 

Automated voice services 

Power IVR and voice bots with a natural tone that feels human, not robotic. 

Global business communications 

Enjoy high-quality calls worldwide, powered by our global network.

HOW IT DELIVERS 

Built-in capabilities that power every HD call 

Wideband audio codecs 

Hear the full richness of voices with broader sound frequencies thanks to industry-leading codecs. 

Global low-latency network 

Geo-redundant, Tier-1 backbone optimizes routes to reduce lag and keep uptime high. 

Multi-device support 

Use HD Voice on desk phones, mobile apps, and web browsers with no extra setup required. 

Secure communications 

End-to-end encryption with TLS/SRTP plus ISO 27001 and GDPR compliance keep conversations protected. 

Frequently asked questions about HD voice 

HD Voice, or high-definition calling, uses wideband audio codecs to capture more sound frequencies, so conversations sound clearer and more natural compared to standard narrowband calls. 

HD Voice is a core feature of Voice API, Elastic SIP Trunking, and In-App Voice & Video Calling, making it easy to add high-definition calling to any workflow. 

No, HD Voice is included with Sinch voice products. You only pay for what you use. 

Choose your preferred Sinch Voice product, configure your numbers and call flows in the dashboard or via API, and jump right into making crystal-clear calls. HD calling is included by default. 

Yes. All calls are encrypted with TLS/SRTP, and Sinch is ISO 27001 certified, GDPR compliant, and STIR/SHAKEN compliant for enterprise-grade security. 

Yes, HD Voice uses a global, low-latency network to provide consistent, high-quality audio no matter where your calls connect from. 

Talk to an expert about improving the quality of your voice calls

See how Sinch delivers crystal-clear, HD audio with 99.95% uptime, and secure, global calling—built for every channel.