Granite Transforms Microsoft Teams into Business Phone System with Direct Routing Share Article Granite Transforms Microsoft Teams into Business Phone System with Direct Routing “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." QUINCY, Mass. (PRWEB) April 06, 2021 Granite Telecommunications, a $1.6 billion provider of communications services to multilocation businesses and government agencies, today announced support for Direct Routing to Microsoft Teams, which enables businesses to make and take external phone calls inside the Teams collaboration application on their desktops, laptops or mobile devices.