Browser Calling 101

WebRTC Calling Explained

Start the call from any browser tab. There is no download, and you only add a number to receive inbound calls.

Product facts

  • Outbound: No dedicated number required.
  • Inbound: Requires US/Canada digital number ($2.14 to $5/month).
  • No apps: Works in Chrome, Safari, Edge, Firefox.
How It Works
Browser Call DemoWebRTC Ready
No downloads. Works in Chrome, Safari, and Firefox.

What is WebRTC

WebRTC is an open standard that enables real-time audio and video communication inside the browser. It eliminates the need for plugins or native apps and gives developers low-latency access to microphone and camera streams.

Real-time Audio

High quality audio streaming with adaptive codecs, echo cancellation, and packet loss resilience for stable calls even on variable networks.

Peer Connections

Secure peer-to-peer connections with NAT traversal and secure DTLS encryption to keep voice data private and protected.

Browser First

No app installs required. Users join from modern browsers and start calling in seconds after granting permissions.

How StartACall Bridges WebRTC to PSTN

WebRTC handles the browser side. StartACall provides signaling, media relay, and a PSTN gateway using Twilio so you can place or receive calls to any phone number worldwide.

Signaling

We handle session setup and management so browsers can connect securely and quickly without user configuration.

Media Relay

Media servers optimize audio routing, ensure compatibility across networks, and provide recording or transcription hooks for AI features.

PSTN Gateway

We route calls to the public telephone network using Twilio so your browser calls reach any mobile or landline number worldwide.

Key Benefits for Businesses

WebRTC based calling simplifies operations, improves agent workflows, and unlocks AI capabilities that run during or after calls.

and Copilot

Autonomous AI voice agents can handle inbound or outbound calls. Real-time copilot features transcribe conversations and surface suggested responses to agents during live calls.

OpenAI powered conversational flows
Deepgram speech recognition for accurate transcription

Virtual Numbers and Analytics

Purchase and manage phone numbers in over 190 countries and track call metrics and usage in real time through an intuitive dashboard.

Global coverage with local presence
Call duration, transcription, and analytics in real time

Frequently Asked Questions

Is WebRTC secure?

Yes. WebRTC uses strong encryption for media and signaling. StartACall also applies secure session management and best practices to protect calls and data.

Can I use WebRTC on mobile browsers?

Modern mobile browsers such as Chrome and Safari support WebRTC. For the best experience use the latest browser versions and grant microphone access.

How does transcription work?

StartACall integrates speech-to-text engines to transcribe calls in real time. Transcripts can power copilot suggestions or be stored for analytics and compliance.

Do I need Twilio?

StartACall uses Twilio on the backend to reliably bridge WebRTC sessions to the PSTN. You do not need a separate Twilio account to use StartACall.

Ready to try browser calling?

Create an account and start calling from your browser in seconds. No downloads, no complicated setup.

WebRTC Calling Explained: How Browser Based Calls Actually Work

In short

WebRTC, short for Web Real Time Communication, is the open technology that lets your browser place and receive voice calls directly, with no app to install and no SIM card. StartACall uses WebRTC so you can call from Chrome, Safari, Edge or Firefox, pay per minute, and keep every call end to end encrypted.

What WebRTC is and why it matters for calling

WebRTC is a free, open standard built into every modern browser. It captures audio from your microphone, compresses it, and sends it as a real time stream to the other party. Because the engine already lives inside Chrome, Safari, Edge and Firefox, there is nothing to download and no plugin to enable. You open a web page, grant microphone access, and you are ready to talk.

The practical payoff is reach without setup. Any device with a browser and an internet connection becomes a phone. That means a laptop, a tablet, a Chromebook or a phone with no active SIM can all make and take calls, which is exactly why WebRTC has become the foundation for modern browser based calling.

How a StartACall WebRTC call connects

When you start a call, WebRTC sets up a secure media path between your browser and StartACall, which then bridges the audio to the regular phone network so you can reach any normal phone number. Outbound calls need no phone number of your own and are pay as you go, billed by the minute, so you only pay for the time you actually talk.

All audio is end to end encrypted in transit, which is one of the core security guarantees of the WebRTC standard. To also receive inbound calls, you add a US or Canada digital number for roughly 2.14 to 5 dollars per month, and incoming calls ring right in your browser tab.

When browser based calling makes sense

WebRTC calling shines for international calls, business lines and privacy minded users. There is no hardware to buy, no contract, and no app permissions beyond the microphone, so you can spin up a working line in minutes and shut it down just as fast. For occasional or unpredictable usage, per minute billing usually costs far less than a traditional plan.

Frequently asked questions

Do I need to install anything to make a WebRTC call?+

No. WebRTC is built into Chrome, Safari, Edge and Firefox, so you only open StartACall in your browser and allow microphone access. There is no app download, no plugin and no SIM card required.

Is WebRTC calling secure?+

Yes. StartACall calls are end to end encrypted in transit, which is part of the WebRTC standard. Your audio is protected as it travels between your browser and the network, making it a strong choice for private and business conversations.

How much does a WebRTC call cost?+

Outbound calls are pay as you go and billed per minute, so you only pay for the time you talk and need no phone number of your own. If you also want to receive calls, you add a US or Canada digital number for about 2.14 to 5 dollars per month.

Can I receive calls in my browser too?+

Yes. Once you add a US or Canada digital number, inbound calls ring directly in your browser tab using the same WebRTC connection, so you can answer from any device with a browser.

Last reviewed June 2026Reviewed by the StartACall calling teamDialing rules cross checked against ITU international dialing procedures
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