Alcatel-Lucent 8068 Premium - Sending Dtmf Signals; Mute, so that Your Caller Cannot Hear You

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2.11 Sending DTMF signals
During a conversation you sometimes have to send DTMF signals, such as with a voice server, an
automated attendant or a remotely consulted answering machine.
 During a conversation
 Use one of the following:
o Send DTMF
o Press the star key
 Enter DTMF code
The function is automatically cancelled when you hang up.
2.12 Mute, so that your caller cannot hear you
You can hear your caller but he/she cannot hear you:
From the set
 During a conversation
 Disable microphone The key lights up
 Resume the conversation The key is no longer lit
From the Bluetooth® receiver
 Press the handset volume/mute key (long press)