You can configure the Telephone app in MacOS to a device in Voice Platform by following these directions:
- Add the Device to Platform, and select Advanced view to reveal the SIP tab.
- Copy or locate the Realm (Server), Username, and Password.
- Open the Telephone app on your MacOS device
On your keyboard, press ⌘ and , to access the Preferences menu (or select Telephone > Preferences)
Press the + to add a new Account and enter the device information:
Select Done and make sure to check Use this account
Once checked for use, a new window will appear that will allow you to make calls