Using Dialog+
Turning Phone ON/OFF
Hold down the red 
key on the handset for one second to turn phone on or off.
Volume Control
Use the Volume keys on the left side of the handset to increase or decrease the volume.
Press and hold 
for one second to maximize volume.
Press and hold 
for one second to mute volume.
Setting System Audio I/O
Playing system sounds through speakers, keeping phone calls through the handset.
Macintosh
Open System Preferences, Sound. Click on the Output tab.
Set the sound device for output to Internal Speakers. Set the sound device for Input on the Input tab to
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