Voice capabilities heard loud and clear.

Build easier and reach farther with our unique features.

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The most-loved Voice features on our powerful platform.


Easily integrate with third party vendors in real time, including artificial intelligence bots.

Voice Quality Engine

Deliver high quality voice experiences using our reliable global carrier network.

WebRTC Enabled

Calling over IP and PSTN with powerful programmable voice features to improve business outcomes and user experience.
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Gain advanced call control and routing.

Nexmo Call Control Objects

Experience more flexibility using a JSON array of actions to control the flow of your Voice API calls.


Create globally supported audio conferences with just a few lines of code.

Audio Playback

Enable a rich calling experience with customized voice prompts and hold music.

Auto-Join Conference Calls

Make conference calls effortless by having callers automatically join as a meeting begins.

Answering Machine Detection

Provide a customized experience depending on whether a live person or answering machine is reached.

Recording Management

Integrate stored call recordings with your preferred workflow tools or build your own dashboard.


Scale your calls globally with the ability to speak text to callers in multiple languages and accents.

Audio Streaming

Easily stream stored media audio files right from your Nexmo Call Control Object (NCCO).

Early Media Support

Play sounds such as ringback tone to the calling party before the call is answered.

Split/Multitrack Recording (Beta)

Record up to 32 call participants in separate tracks to enable more accurate call transcription, content search, sentiment analysis and more.

Speech Synthesis Markup Language (SSML)

Programmatically control the pronunciation of text, including punctuation, pausing, emphasis, volume, pitch, rate of speech, phonetic pronunciation and context disambiguation.

Selective Audio Controls (Beta)

Establish an exclusive audio feed for a select call participant to provide feedback and guidance during any conversation.

Globally Distributed Call Controls

Keep your call control signaling local with our global distribution of data centers to reduce latency and improve overall call quality.

SIP Connect (beta)

Bring feature rich calling to your SIP deployment with Split/Multitrack Recording, TTS, Websocket connectivity and more.

Reach customers around the globe.

Local Phone Numbers

Instantly provision local, toll-free, mobile, and landline numbers in over 65 countries worldwide.

Clean Phone Numbers

Avoid unwanted calls or spam with our phone numbers from top tier suppliers.

Toll-Free Phone Numbers

Communicate more efficiently through SMS or voice calls with a business toll-free number.

Elastic SIP Trunking

Extend your reach to the PSTN using your existing VoIP infrastructure and the Nexmo cloud.

Easily manage your services.


We’ll help you troubleshoot problems quickly and thoroughly.


Additional secondary accounts help you organize multiple applications or services.

User Permissions

Scale and assign permissions by user to avoid confusion and mix-ups at any level.

Dashboard Analytics

Get detailed insights on your campaigns, down to the recipient’s cellular network and country of origin.


Automate complex reporting tasks and seamlessly integrate usage data with any app.

Nexmo Developer

Read the docs, explore our libraries, and connect with other developers.

Knowledge Base

Quick answers to common questions on API interfaces, regulations and more.

Let’s build something great together.

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