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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WebSockets

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.

Conferencing

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

Audio Playback

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

Auto-Join Conference Calls

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

Answering Machine Detection

Provide a customised 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.

Text-to-Speech

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 signalling local with our global distribution of data centres 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, freephone, 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.

Freephone Phone Numbers

Communicate more efficiently through SMS or voice calls with a business freephone number.

Elastic SIP Trunking

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

Manage your services easily.

Monitor

We’ll help you troubleshoot problems quickly and thoroughly.

Subaccounts

Additional secondary accounts help you organise 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 mobile network and country of origin.

Reporting

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

Envelope

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