In ECS various Local and Global port setting can be made in the advance settings box. These settings affect how the port inter-acts with other ports.Navigate to setup matrix hardware and highlight the port in question. Full details of each function can be found in the ECS manual, which can be downloaded from the Clear-Com web site http://www.clearcom.com/support 

A small selection is detailed below Secondary action: Whenever any other port TALKS to this port. The Secondary action will activate. The action can be a relay, route or speed dial Split label: When set true. The panel key display will only show the talk or listen label for panels with 10 char displaysAuto listen: when set true , any port TALKing to this port will also hear the incoming audio from this portLatch Disable: When set true , no panel can Latch a key to talk to this panelInput Volume: Adjust the input level of this port (this is referenced to the Matrix - input to the matrix)