Microsoft Teams provides audio and video calls for free between users either on the business tenant, on another tenant or even a guest user, using the technologies behind Skype for Business. Teams has business chat, host business meetings, collaborate internally and externally and lots more.With a unified Teams Voice VOIP phone system, users can make calls using Teams on their PC, from Outlook or any mobile device.With the recent addition of porting your business phone numbers to Microsoft Teams, there’s never been a better time to improve remote working by removing the tie between physical location and your users phones.