This is one of the neatest parts of imp: Everyone in your household with a smartphone can help manage your imp. We have different levels of power for Owners, Co-Owners, and Limited Users, but each of those levels can add numbers to the collective Greenlist, and help manage calls as they come in.
To add a new user, open the imp app and select settings>invite users> and add the user info. For more on inviting new users, check out this article: Adding users to my imp box