Communication system selective call screening arrangement

摘要

A call screening arrangement is disclosed for an intercom communication system in which call features are activated by entering a two digit code from the rotary or multifrequency dial of the connected station sets. Incoming calls to a called station are screened according to the type of call features activated at the called station. The particular call screening feature activated is determined by the order of the sequential activation of the existing Call Forwarding, Callback or Do-Not-Disturb call features. The call screening features enable incoming calls controlled by either a Call Forwarding or Callback feature to selectively bypass a Do-Not-Disturb call blocking feature at the called station. When activated individually the Call Forwarding, Callback and Do-Not-Disturb features perform their individual call control routines.