Granite Direct Routing transforms Microsoft Teams into a business phone system, so users can make business calls to customers or vendors from the same Teams workspace they use to collaborate with internal teammates. With one centralized hub for internal and external calling and collaboration, businesses can save time and improve productivity. Plus, they can work anywhere, which is vital in the current environment. It enables calls to the public switched telephone network (PSTN) by connecting Granite's SIP trunking service to the Microsoft Phone System inside Teams.