█Turning the Handset “Power On/Off” Mode
The A600 handset can be turned to “Power Off” mode, which can be a convenient way to prevent the phone from ringing without having to change the ringer setting. When you turn the handset to “Power Off” mode, calls can’t be made or received until you turn the power back “On”.
In Standby Mode (not during a live call):
1.To turn the handset “Off”, simply press and hold 
until the display turns off.
2.To turn the handset “On”, you can either:
a.Place the handset back into the base and the handset will automatically power on.
b.Press and hold 
until the display turns on.
█Using your Phone with Hearing Aids and Cochlear
Implants
Your phone can be used with hearing aids and cochlear implants equipped with a telecoil
█Using the Phone Hands-Free Headset Jack
Your phone is equipped with a Phone Headset jack (located on the left side of the handset), providing flexibility and multi- functionality. This jack is amplified, allowing you to adjust both the tone and volume the same as you would through the handset or speakerphone.
By using this jack, you can listen and speak through your hands- free headset. This 2.5mm phone headset jack accommodates a variety of optional
NOTE: When a 2.5mm audio device is plugged in, the incoming audio signal to the handset will now be transferred to the headset jack. No output on the handset will be heard. As soon as you plug your headset into the jack, it will be activated.