The present invention refers to a method for monitoring calls to a telephone set, by which a voice message is played back on a speaker of a telephone set at the same time that such message is received by the equipment. The invention also refers to a Hands-Free device or Headsets that are used with mobile telephones and enable users to monitor calls in Whisper Mode, that is, not by directly responding to the caller, but by listening to the message left by the caller in real time while it is being recorded, offering the option to interrupt the process and establish a conversation with the caller. This system can also use a remote server to expand the message storage capacity.
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