Alcatel-Lucent M5 - 3.9 Sending DTMF signals; 3.10 Mute, so that your contact cannot hear you

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Using your telephone
8AL90382ENAA ed03
3.8.2 Make call using speed dial
Select the key associated with the contact to call.
3.9 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.
Enter DTMF code.
To activate or deactivate DTMF mode
The phone is in idle state.
Menu
Press the Menu soft key to access the Main Menu.
Basic Setting
Use up-down and 'ok' navigation keys to select: Basic Setting.
Sound Use up-down and 'ok' navigation keys to select: Sound .
DTMF Tone Use up-down and 'ok' navigation keys to select: DTMF Tone .
Switch or
To activate or deactivate DTMF mode.
or Save
Validate your choice.
To end the settings.
3.10 Mute, so that your contact cannot hear you
You can hear your contact but he/she cannot hear you:
During a conversation.
Disable microphone the key lights up.
Resume the conversation the key is no longer lit.