A connection started from Scheduled Room sessions checks if there is any records that matches the given duration, startDateTime and credentials in the database (that is created with the Meeting Resources API). If there are none, it will not start the connection.

A connection started from Non-Scheduled Room sessions does not require checking of the duration, startDateTime and credentials but starts the connection immediately based off the given configuration (whether the authentication is via the Credentials method or CORS method).

Other articles you may be interested in: What is the Scheduled Sessions (Persistent Room) feature?How can I use the Scheduled Sessions (Persistent Room) feature to configure meetings?What are the scenarios for Scheduled Room sessions?