Aircall Aircall is an online phone system built for teams

Aircall lets you instantly get the phone numbers you need anywhere in the world and distribute calls easily over your teams, wherever they are.Each teammate can make, receive and follow-up on calls using the Aircall app of his/her choice (web, Mac, PC, mobile – no hardware required!)Aircall automatically connects all your account information to Slack: new calls, availability of your users, state of your numbers…Try Aircall for free – signup for a 7-day free trial here https://aircall.io/signup/
After the trial period, a paid account is required to keep using the app.