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What are Programmable Voice Calling APIs?

Programmable Voice Calling APIs are cloud based services provided by communication platforms that enable developers to add real-time voice-calling functionality to their applications. It allows developers to create custom voice communication solutions, such as voice calling, conference calls, voicemail, and more, by providing programmable building blocks for implementing complex voice communication workflows. 

With Programmable Voice API, developers can easily integrate voice communication into their applications without needing to manage underlying telephony infrastructure. This API also offers features such as call recording, call analytics, and call routing to create a complete voice communication solution.

Features that Make Fonada’s Calling API Unique

Say it loud, say it clear with our programmable voice API solution

Call and SMS Campaigns

Conduct bulk calling and messaging campaigns with dynamic or static content.

Virtual Number Allocation

Buy, retrieve, assign, and remove virtual numbers dynamically to your call flows.


Allow users to initiate calls from your website or app.

Passwordless Authentication

Verify users through missed calls using our patented nOTP product.

Virtual Number Monitoring

Keep track of your Exophones' health and receive real-time alerts when a number goes down.

Cost-Effective Number Mapping

Manage customer conversations with a limited pool of virtual numbers to save costs.

How Do Voice Calling APIs Work?

Below is an explanation of how the Calling API works

Step 01

Developer integrates Voice Calling API into app/website.

Step 02

Defines rules for call flow (initiation, message, user response handling).

Step 03

User triggers call (e.g., by clicking a button).

Step 04

API calls user's phone/VoIP.

Step 05

User hears message, can respond via keypad.

Step 06

API processes response, takes actions based on rules.

Step 07

Call ends when flow is complete or user hangs up.

Step 08

The call ends when the predefined call flow is complete, or the user hangs up.

Why Voice Calling APIs For Your Business?

Experience the speed and flexibility within our programmable voice API

Improved Call Management

Track and monitor calls automatically with audio calling API and fetch valuable insights and visibility.

Increased Productivity

Boost efficiency and streamline workflows by enabling click-to-call functionality within CRM and help desk.

Enhanced Privacy Protection

Protect the privacy of both callers and callees by concealing their information behind a virtual number with call masking.

Empowering Customers

IVR automation and self-service options allow customers to access important information, cancel tickets, and check account balances on their own.

Flexible Call Routing

Programmable voice API allows call flows to be dynamically programmed based on customer input, ensuring calls are routed to the appropriate agent or department.

Calling APIs Use Cases


Integrating With Third-Party Services

APIs are often used to integrate with third-party services such as payment gateways, social media platforms, or weather services.


Data Collection And Analysis

Programmable voice APIs can be used to collect and analyze data from various sources, such as social media feeds or IoT devices.


Creating Custom Applications

APIs can be used to build custom applications that leverage data and functionality from other applications.


Automating Tasks

APIs can be used to automate tasks such as data entry, file transfers, or report generation.


Building Chatbots

APIs can be used to create chatbots that can interact with users and provide information or perform tasks.


Developing Mobile Applications

APIs can be used to develop mobile applications that access data and functionality from backend servers.


Creating Web Applications

APIs can be used to create web applications that can access data and functionality from other web services.

Benefits of Using Fonada’s Voice Calling APIs?

Protect The Privacy Of Customers

Number masking protects the caller and callee. A virtual phone number hides the identities of both parties.

Enhance Productivity

Integrate telephony with your helpdesk, CRM, or app using our click-to-call API. Click a button to call without manually dialing.

Call Tracking

We monitor all calls. Our all-details API provides more call visibility.

Platform Independent

Our calling API works efficiently with various platforms, and you can seamlessly integrate API calling in Android or desktop applications.

Dynamic Call Flows

Using input from your customers, programmatically decide call flows. Quickly route calls to the right agent/department.

Why Choose Fonada for Voice Calling APIs?


Fonada uses high-quality, reliable infrastructure with its call-handling API to ensure lag-free voice connections for minimized call drops or delays.


Our programmable voice API solutions can efficiently handle high volumes of calls, making it suitable for businesses of all sizes.


We offer flexible programmable calling API solutions that can be customized to meet the unique needs of your business.


We offer a range of measures with our phone call API and follow high-security parameters to protect against fraud, abuse, and other threats.

Excellent Customer Support

We offer excellent customer support as our team of experts is readily available round the clock to help customers with their queries and concerns.

Frequently Asked Questions

What is a calling API?

Integrating voice calling into any application or website is possible using a phone calling API. It connects the PSTN (public switched telephone network) and online apps. Voice API enables software call control, custom call flows, and more.

How do API calls function?

Most web APIs are between the app and the server. The user makes an API call that instructs the application to do something, and then the application asks the webserver to do something. The API call is the application’s request to the web server.

Can we integrate API calling in Android phones?

Yes, Fonada's Calling API solution is highly configurable with Android applications.

Is there voice calling api for Android available in the market?

Yes, voice calling APIs are available for almost every platform and they work smoothly with desktop and Android apps