In an incoming call service by which an extension can be directly called when a call comes in from another office, a dedicated terminal for selecting an extension to which the incoming call is connected is installed to enable the user to select it as desired, thereby increasing usage of call incoming...http://www.google.fr/patents/US5563940?utm_source=gb-gplus-shareBrevet US5563940 - System for connecting an incoming call to a selected one of a number of extensions
System for connecting an incoming call to a selected one of a number of ...
