# Sessions

Sessions occur between the Catalyst and a Destination. They consist of an exchange of information termed reports. An example of a session is what occurs when a Catalyst calls an operator's phone number to deliver a notification report in voice mode. Another example is when a central computer running Alarmware calls an RTU in order to make configuration changes. They are both considered sessions.

Sessions have a beginning and an end. For example, a phone session with an operator starts when the RTU dials a phone number, and ends when either the operator, or the RTU, terminates the call.