Voice with the power of programmability

A voice API is a tool that enables your web application to make and receive phone calls. It can immediately connect you to the Public Switched Telephone Network (PSTN) so you can call people anywhere in the world, on any device, through any network via an internet connection. It can also place calls over the internet, through VoIP calling, to reach applications connected to the internet.

A voice API is easy to integrate and can get you connected in minutes. It doesn’t require telecommunications hardware to handle voice calls. 

See a full Voice API definition

A voice calling app is an application that can make and receive phone calls. It can connect you to the Public Switched Telephony Network (PSTN) and VoIP applications so you can reach people anywhere, on any device.

A voice calling application usually includes additional features and functionality, like call transcription, voice recording, interactive voice response (IVR), SIP interfacing, text-to-speech and more.

See more features you can build into a voice app

• Alerts and notifications - Automated phone calls to notify customers about password resets, low-balance alerts, upcoming appointments, and fraud warnings. 
• IVR - A customer interactive voice response system for self-service that can respond to commands, support text-to-speech in hundreds of languages, and route customers to the right representative when they need one. 
• Call tracking - A way to tie incoming calls to specific digital campaigns for ROI measurement, as well as routing leads to the right representative. 
• Embedded calling - A WebRTC-powered voice calling app that works across browsers and devices. 
• Global conferencing - Multiparty calling experiences for up to 250 participants.
• Masked calling - A way to connect customers to employees without revealing personal phone numbers of either parties.

Yes. As a default security measure, Twilio Voice uses encryption at rest for call recordings stored with Twilio.

We also have a Call Recording Encryption feature that encrypts all records with a public key which can only be accessed by the holder of the corresponding private key.

Learn more about call recording encryption

Twilio Voice is pay as you go, which means you pay per call and duration. There are different charges depending on the type of call you’re making, the number you’re calling, and the features you’re using.

You can visit our voice pricing page to see a detailed breakdown.

Twilio Voice Intelligence is a feature that uses AI-powered language operators in addition to call transcription to identify and extract important signals from unstructured voice calls at scale. 

Learn more about Voice Intelligence

Twilio also recently introduced CustomerAI Perception Engine, which can gather insights from customer calls and use that information to build or enrich customer profiles. 

Learn more about Perception Engine