Guest users are people with whom you can communicate and collaborate in the app but who do not work at your company. Guests might be clients, partners or vendors. Guest users only have access to teams to which they are given access.

Guest users are only available to companies that sign up on a private email domain (e.g., @ringcentral.com) since anyone that you add that has an email address that isn't on your company's private domain is considered a guest.

NOTE:  If you signed up with Gmail, Yahoo, or any public domain emails, your company will not be able to take advantage of guests.