What Is VoIP?

Voice over Internet Protocol (VoIP) is the technology that converts your voice into digital data packets and transmits them over the internet — the same way emails and web pages are sent. Unlike traditional phone calls that travel over dedicated copper lines, VoIP calls share the same broadband infrastructure you use for everything else.

This shared-infrastructure model is why VoIP calls cost a fraction of traditional international calls. There are no dedicated transatlantic circuits to lease, no per-minute fees paid to analog telephone companies in each country.

WebRTC: The Browser's Secret Weapon

Voxa uses a modern web standard called WebRTC (Web Real-Time Communication) to capture your microphone audio and transmit it securely, all without any plugins or downloads.

Here's the simplified flow:

  1. Permission request — Your browser asks for microphone access. Once granted, it starts capturing your audio at 48,000 samples per second.
  1. Audio encoding — The raw audio is compressed using the Opus codec, a modern format optimized for voice that dramatically reduces bandwidth usage without sacrificing clarity.
  1. Packetization — The compressed audio is broken into small packets, each about 20 milliseconds of audio, and stamped with timing information.

4. Encryption — Every packet is encrypted using DTLS-SRTP before leaving your device. Nobody — not your ISP, not a network observer — can listen to your call.

5. ICE negotiation — WebRTC uses a protocol called ICE to find the best network path between your browser and the server. This handles NAT traversal, firewall detection, and selecting the lowest-latency route.

6. Transmission — Packets travel over the internet to Voxa's media servers, which relay them to the telecommunications carrier for the destination country.

7. PSTN connection — The carrier converts the VoIP packets back into a traditional phone signal and rings the number you dialed.

Why Call Quality Can Vary

VoIP call quality depends on three key network factors:

  • Latency: The time for a packet to travel from you to the server. Under 150ms is ideal for natural conversation. Most calls on a reliable broadband connection achieve 40-80ms.
  • Jitter: Variance in packet arrival times. Voxa's media servers use a jitter buffer to smooth this out, holding packets briefly and releasing them at a consistent rate.
  • Packet loss: Packets occasionally don't arrive. The Opus codec includes redundancy — it can reconstruct missing audio from surrounding packets, which is why calls on Voxa remain clear even on connections with up to 5% packet loss.

How Voxa Routes Your Call

When you dial a number on joinvoxa.com, the following happens in under a second:

  1. Voxa's platform parses the destination number and identifies the country and carrier
  2. The call is routed to the lowest-cost, highest-quality carrier for that destination from our network of tier-1 partners
  3. The carrier terminates the call to the local telephone network
  4. Voxa's billing system calculates per-minute costs and deducts them from your credit balance in real time

This intelligent routing is why Voxa can offer rates competitive with local carriers in each country, even for remote destinations.

The Bottom Line

Browser-based VoIP calling has matured to the point where it's indistinguishable in quality from traditional phone calls — and orders of magnitude cheaper for international destinations. The technology that powers Voxa is the same WebRTC standard used by Google Meet, Zoom, and every other major video conferencing platform. The difference is we've optimized it for pure voice calling with the simplest possible user experience.

No app. No plugin. No subscription. Just open your browser and call.