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¦ The handset is off the phone for a long time (for instance, overnight). It may take a few minutes for your headset to return from the power-saving mode to the active mode when calls first come in, so your telephone may not ring until the headset has returned to active mode, and you may miss a call. If you plan to not use the headset for a long time (for instance, overnight), 3Com recommends that you set the mute and headset buttons on the amplifier to Off and hang up the handset on your teleph