The invitation that everyone sees when they click the link in the conference call invite email they receive will show the toll-free number if you specify the toll-free option.
You can tell people about the 619-2-RONDEE number if you’d like, and they’re welcome to use that. We have users who mention that phone number in the description of their Rondee.
In any event, people can access your conference call from either phone number. You are only charged for the minutes accrued on the toll-free number.