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.