How VoIP Works
Your calls, over the internet.
VoIP replaces the traditional phone network with something faster, cheaper, and more flexible. Here's exactly how it works — from the moment you dial to the moment your call connects.
The basics
What is VoIP?
Voice over Internet Protocol (VoIP) converts your voice into digital data and transmits it over your existing internet connection — the same connection you use to browse the web or stream video.
Instead of routing calls through copper phone lines and the public switched telephone network, VoIP routes them over the internet. The result is a phone service that costs a fraction of traditional landlines while offering more features.
All you need is a reliable internet connection and a device with a microphone. No desk phones, no landlines, no installation.
Works on any device
Any area code
iOS & Android app
SMS & calling
Voicemail included
Call forwarding
Spam filtering
Keeps your number private
The technology
Old network vs. new network.
Understanding the difference between how traditional phones and VoIP handle your calls explains why VoIP is cheaper and more flexible.
The old way — Circuit Switching
A dedicated line, reserved just for your call
Traditional phones use circuit switching — a dedicated two-way copper-wire connection is held open for the entire duration of your call.
That reserved infrastructure is expensive to build and maintain. Legacy carriers pass those costs on through per-minute charges and monthly fees that add up fast.
The new way — Packet Switching
Your voice travels as data — just like a webpage
VoIP uses packet switching — your voice is digitized, compressed, and broken into small data packets that travel across the internet independently.
Each packet finds the fastest available path and reassembles at the destination in real-time. No reserved line, no per-minute costs, no infrastructure overhead.
Step by step
What happens when you make a VoIP call.
Every step happens in milliseconds — by the time you hear the ringback tone, all four have already occurred.
1
Dial a number
Use your smartphone, desktop, laptop, tablet, or IP desk phone. VoIP works on any internet-connected device with a microphone.
2
Provider establishes connection
Your VoIP provider connects the call using SIP (Session Initiation Protocol), routing it across the internet in milliseconds.
3
Packet switching transmits audio
Audio travels as digitized, compressed data packets from one user to another — the same way a webpage loads in your browser.
4
Packets reassemble at destination
The receiving device reassembles packets into clear analog audio in real-time. To the listener, it sounds just like a regular phone call.
VoIP call quality is tied to your internet connection. A minimum of 100 kbps per line is recommended. On most modern broadband connections, VoIP is indistinguishable from a traditional phone call.
Getting started
Up and running in minutes.
No IT team, no hardware, no installation. Getting a VoIP number from VoIP.com takes less than five minutes.
1
Choose your number
Pick any US area code you want. Search by city, state, or area code — your number is ready the moment you claim it.
2
Create your account
Sign up with just an email address. No contracts to sign, no hardware to purchase, no IT setup required.
3
Start calling
Download the softphone app on your phone or desktop and start making calls within minutes of signing up.
Ready to make the switch?
$9/month. No contracts. No hidden fees. Your first line is free.