Enterprise Alert can setup a conference call with the Callout section. This is helpful when all members of a team need to collaborate on a high priority issue.
In the Callouts section select Voice Conference as a notification method.
The originator (user who pressed GO in the callout section) is announced as wanting to join a conference call. Other team members hear the message that is specified and AFTER the message is played, the prompt to press 1 to join the call is initiated. From there it connects the party members. Keep in mind this may be limited to the number of outbound lines configured in the Notification Channel.