Optional
additional_Each service desk may require different information to start the connection. It can be account details or security information. This is a bucket of all the service desk specific properties.
Optional
session_A key used by the service desk to securely load the session history.
Optional
summary_An initial set of message items to send to the agent.
Additional information as part of a ConnectToAgentItem that may be need to perform a transfer to an agent.