Intertel Encore 618.5005 CX 8-Port Station Module (Refurbished)Key Features: Mnfr Part #: 618. 5005 This expansion module adds 8 extensions and up to 4 additional CO lines to your Intertel Encore CX KSU. The Encore CX System can handle up to 4 port modules and a maximum of 20 CO lines and 40 extensions. The extension ports are hybrid which will enable you to put any single line device or Intertel CX digital telephone on this system. This 8 port station module requires the expansion backplane.