Speakerphone state-controlled alerting arrangement.

摘要

A telephone station set (100) alerting arrangement preferably uses a speakerphone loudspeaker (140) to produce audible alerting signals (e.g., ringing signals) from locally-generated (105) alerting signals both when the set is on-hook and when the set is off-hook. The present state of the speakerphone control circuit (102) is used to control the volume of the produced audible alerting signals; high-volume alerting signals are supplied to the loudspeaker when the control circuit is in talking state, and low-volume, attenuated, alerting signals are supplied to the loudspeaker when the control circuit is in listening state. The appearance of alerting signals when the speakerphone control circuit is in idle state causes the speakerphone circuit to make a transition to the talking state. <IMAGE>