Enter a number

Settings

Configure Twilio to enable calling

Account SID

Console → Account → API keys & tokens → Account SID

API Key SID

Console → Account → API keys & tokens → Create API key (Standard)

API Key Secret

Shown once when you create the API key above — copy it immediately

TwiML App SID

Console → Voice → TwiML → TwiML Apps — set its Voice URL to this app's /voice endpoint

Auth Token

Console → Account → API keys & tokens → Auth Token — used only to verify that /voice webhook requests really come from Twilio, not to sign calls

Twilio Phone Number

The number callees will see as caller ID

Your Name / Identity

Sign up at twilio.com and get a phone number
Create an API Key and a TwiML App in the Twilio Console
Enter your Account SID, API Key SID/Secret, TwiML App SID, Auth Token, and phone number above
Dial any number — the call goes directly from your browser