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Voice API features

Voice capabilities heard loud and clear. Build easier and reach farther with our unique features.
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The most-loved Voice API features on our powerful platform

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Easily integrate with third-party vendors in real time, including artificial intelligence bots. Learn more
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Voice Quality Engine

Deliver high quality voice experiences using our reliable global carrier network. Learn more
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WebRTC Enabled

Conduct calls over IP and PSTN with powerful programmable voice features to improve business outcomes and user experiences.
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Automatic Speech Recognition

Add voice control and enable easy to use self-service with Automatic Speech Recognition powering Voice Enabled IVRs, Order Submissions and more in over 120 languages. Learn more

Gain advanced call control and routing

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. Learn more

Audio Streaming

Easily stream stored media audio files right from your Call Control Object.

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.

Programmable SIP

Extend your existing SIP deployment to realize programmable voice experiences and contextual conversations, including AI enablement. Learn more

Voice Inspector (Beta)

Easily obtain call-quality measurements, perform debugging of calls, and facilitate testing of new voice applications on your platform. Learn more

Fraud Defender

Protect your revenue and reputation with real-time alerting and automatic blocking of suspicious traffic.

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 Vonage API 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.
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Vonage AI Services - Voice Bot Package

Leverage AI Experts and the Vonage AI engine to deploy, maintain, and optimize your brand’s AI experience. Learn more

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