A method of canceling setup of a real-time media conference session
between an originating station and a terminating station via a conference
server in a scenario where the conference server receives an invitation
message from the originating station to set up a conference session with
the terminating station and the conference server receives a cancellation
message from the originating station before setup of a conference leg
between the conference server and the terminating station is complete. In
such a scenario, the conference server would complete setup of the
conference leg between the conference server and the terminating station.
Then, the conference server may send a teardown message to the
terminating station. The teardown message tears down the conference leg
between the conference server and the terminating station.