ESI IVX S-Class (IVX 56s) All-In-One Digital Phone System: System Only or Bundled With Four or Eight 48-Key ESI Phone.
ESI IVX S-Class (IVX 56s) All-In-One Digital Phone System: System Only or Bundled With Twelve or Sixteen 48-Key ESI Phone.
ESI IVX 72e E-Class 12 CO x 16 digital x 8 analog, with Twelve 48-Key Phones
