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4.7  Activate/deactivate voice frequency  
This feature depends on the system configuration. If necessary, contact your administrator. During a call, 
you sometimes have to send DTMF signals, for example, for a voice message service, an automatic 
switchboard or when remotely consulting an answerinachine: 
  You are in conversation with one caller. 
The function is automatically cancelled when you hang up. During a conversation, you can activate and 
deactivate the DTMF mode by pressing the * key (long press).