Set up multiple users on a single toll free number using Custom Call Forwarding, then, using Ring-to Number Logins, give each user the ability to track their calls without being able to see the calls of the other users.
Ring-to Number Logins are based on the ring-to number rather than on the Kall8 number itself. The users will be able to see the Call History and Call Analytics for calls that ring to their number only.